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HoI 4 Dev Diary - Japan Rework

Hello, and welcome to the first dev diary of 2018!

Although considering today’s topic perhaps we should call it the first dev diary of the year Heisei 30.

When we decided to expand on China for Waking the Tiger, we also decided that we would need to take another look at the Japanese focus tree and maybe do some minor rework and some alt-history expansions. While we were basically happy with the existing German focus tree, we felt that Japan might need a somewhat more extensive rework, so we asked our QA to compile a list of issues they had with the existing tree.

QA noted the lack of flavor and interesting choices, as well as the lack of really unique gameplay. Their final recommendation was fairly short:

Burn it down. All of it.

So we did.

japan_ft_3.jpg


As you can see, we have expanded the focus tree somewhat in comparison to the old one. The choice between striking north or south was a single focus each in the old tree, but has now been expanded into a full branch.

The first basic choice is what to do with the Kodoha (“Imperial Way”) faction in the military. This faction wanted to remove the last remnants of civilian government and restore the Emperor to his rightful place (i.e. a figurehead while the military has the actual power, as things were before the Meiji Restoration of the 19th century). Historically, supporters of this faction launched a coup in February of 1936 which failed within days as the rest of the military refused to support it.

For reasons of transparency and playability, we decided to not have the coup be an event that fires on or around a set date but made the choice of whether to support or purge the Kodoha faction part of the focus tree. Purging the faction sends you down the historical path to attack China, strike south and attempt to seize the European colonies for their resources.

As you can see, we decided to make Japan form its own faction in the historical path instead of having them join the Axis. The cooperation between Japan and Germany does not fit neatly into our current faction system. While Japan did join the Tripartite Pact, it did not join the war against the Soviet Union, and indeed the Germans concealed preparations to attack the Soviet Union from their Asian allies. While there was some military cooperation and exchange of technical know-how, it wasn’t anything like the scale to which the Western Allies cooperated and indeed closer to the military cooperation between the Western Allies and the Soviet Union.

Still, it is a historical fact that Japan joined the Tripartite Pact, and as such you can do so in the historical path. But instead of joining the Axis faction, it creates a set of mutual guarantees between Germany, Italy and Japan. Should either of them be attacked instead of being the aggressor, they can be called into each other’s wars (and frankly, that is a lot closer to the relevant Article 4 of the treaty).

While still not perfect, we believe that this solves more problems than it creates. In particular, it means that Germany isn’t considered to still be fighting until Japan is taken (which led to amusing side effects such as the Luftwaffe forming the Legion Pekingente and evacuating to Japan when Germany falls). Speaking of taking Japan: AI Japan will now surrender if they have been nuked twice or lost Manchuria and Korea when they aren’t holding any territory in China. A player has the option through the same decision but can, of course, choose to fight to the bitter end (the AI is simply scripted to always pick the decision as soon as possible).

Capture_nuke.JPG


Simulating the war in China itself has come with its own challenges. We wanted to make the war feel like the long campaign it was (lasting, historically, from 1937 to 1945), not least because a Japan with a secure China can bring far more resources to bear on other targets than it did historically. At the same time, China starts with crippling penalties to its army, which means that Japan could easily defeat them. This is not particularly historical, as the Japanese expected a quick victory and were rudely surprised as the Chinese divisions fought very tenaciously.

So in order to make the campaign in China feel historical and give the Chinese player a chance to survive the initial invasion, we gave Japan some penalties for fighting in China (or, specifically, when fighting against Chinese troops). These penalties can be reduced through decisions, which raise world tension, so you will have to balance out the need to finish the campaign fast against raising world tension too quickly. We feel that this best represents the disdain the Japanese military held their opponents in - the Chinese simply weren’t worth a proper effort. Of course you, as the player, can hound your military into actually taking this conflict seriously, but the rest of the world may not like the idea of all-out warfare in China.

If you decide to side with the Kodoha faction, you effectively decide to strike north against the Soviet Union (as many in the Kodoha faction believed that the Soviets were the bigger threat). Subsequently, you will have to do some diplomatic maneuvering to keep your southern flank secure: Where historically the Japanese signed a Non-Aggression Pact with the Soviet Union while they were engaged in China (at least in part because the Battle of Kalkin Gol revealed some serious shortcomings in the Japanese military) to secure their northern flank, now you will have to sit down with the Western powers to ensure they will stay out of your hair while you deal with the Soviet Union. The London Naval Treaty reduces your dockyard output quite dramatically, but should serve to keep the Allies happy enough to look the other way when you go to war with the Communists. You will also have to send some equipment to your Manchurian “ally” to enable them to actually be somewhat useful in the war.

Later on, you can join a technological exchange program with Germany and even gain access to German Rocketry. Going down this path will also allow you to prospect for resources in Siberia.

But of course, you don’t need to follow history quite so closely. The democratic branch assumes that there could have been a significant pushback against the militarization of Japan from forces inside the civilian government. After all, Japan did have a functioning system of democratic elections and a working parliament during the Taisho period, a mere 10 years before the start of the game.

However, the militarists will not go quietly and will rather flee to Manchukuo than to surrender their position. Those elements of the army that can’t or won’t go abroad will start a civil war. Once that has been dealt with, you can rewrite the constitution to turn the Emperor into more of a constitutional monarch like the Europeans have. Afterwards, you can either try to reach out to the British and revive the Anglo-Japanese Alliance that has served so well during the beginning of the 20th century, or you can form your own West Pacific Treaty Organization (or WPTO).

But that still leaves the problem of Manchukuo, now firmly run by the Kwantung Army and supported by the very militarists you kicked out of the country. You will have to go and remove this threat to your freedom with some good old fashioned liberty bombs. From there, you can go and ensure that the colonial powers actually make good on their promises of freedom and self-determination for the native people. After all, if you can have a functioning democracy, why can’t the rest of Asia?

Capture_usa.JPG


Finally, there is the communist branch, which is not quite as far fetched as it may seem. Historically, Japan experienced the same rise of leftist agitation as the rest of the world, and the Japanese Communist Party enjoyed some successes until new legislation effectively banned it. Extensive measures by secret police agencies ensured that by 1936, the party posed little threat to the establishment. That, however, does not mean that there wasn’t a potential for a revolution. A large number of young officers came from a peasant or working-class background, and many civil servants considered socialism to be the way of the future (or in any event better than the Japanese form of capitalism dominated by the huge industrial conglomerates, the Zaibatsus).

hoi4_102.jpg


Historically, these civil servants were quickly banished to Manchukuo or “encouraged” by the secret police to reconsider their political stance. The first step towards a communist revolution in Japan, therefore, is to recall those civil servants that have kept the faith back to the homeland as well as sending a number of militarist hardliners to serve in Manchukuo instead. By arranging for a number of younger and more revolutionary minded officers to be promoted, you will also gain three very loyal and reasonably capable Generals who will definitely serve on your side in the unlikely event that a civil war should break out.

In the next step, you trigger a civil war.

Here, the decision to send the militarists to Manchukuo is both a blessing and a curse, as the Japanese holdings in China are taken over by loyalist troops - who are nonetheless unable to interfere in the civil war in the homelands. Once you have secured the Home Islands, you face another problem: The Emperor has been the foundation of Japan’s political system for thousands of years, and you have just deposed him. Your government has very little legitimacy in the eyes of the people, so you will have to rebuild their trust and stabilize the country. Only then can you go over to the Asian mainland and eradicate the pest of militarism before making common cause with either the Soviets or the Chinese Communists.

Capture_rivalry.JPG


The Japanese military was famous for the poor relations between the Imperial Army and the Imperial Navy (for example, it took the Navy until 1943 to confess that the Battle of Midway hadn’t gone exactly as planned and had in fact included a minor setback). In the game, this is represented by a number of decisions about the prioritization of resources and resolving conflicts between the two parties. Each decision affects a national spirit representing the balance of power between Army and Navy, which affects things like factory output and dockyard construction speed.

Capture_bicycles.JPG


Finally, as part of the rework, we decided to give Japan a bit more flavor by adding two units that are currently unique to Japan: Bicycle Battalions and Torpedo Cruisers. The former are about what you’d expect: infantry mounted on bicycles move a little faster than regular infantry but require some more resources. Although they are currently restricted to just Japan, they might end up being accessible for the rest of the world if we can find a place to put them in the tech tree. The Torpedo Cruisers were a fad in the Japanese Navy, who refitted a number of light cruisers with no less than 40 torpedo tubes (20 per broadside). Together with the Japanese bonuses to torpedo range, they can become a very terrifying force on the high seas - if you can manage to lure the enemy into a decisive surface battle.

Capture_torpedo.JPG


In the process, we also fixed a small issue that pestered some fans of Japanese aviation:

Capture_aircraft.JPG


Similar to the German focus tree, parts of the new focus tree will be part of the Waking the Tiger DLC. While most of the new focuses are free, the communist and democratic branches of the political part will be paid.

We will continue to rework vanilla focus trees in future DLCs (assuming, of course, that this meets with approval from the community), with an eye to which countries make sense with the overall theme of that DLC (for example, reworking the Soviet Union doesn’t really fit into a naval-focused DLC). Expect further updates on future plans after the release of Waking the Tiger.

DLC focus trees will see occasional updates when necessary to accommodate new mechanics (for example, Hungary now inherits Austria’s generals if they manage to form Austria-Hungary) but probably won’t see major reworks.

That is all for today. Tune in next week, when we open up Bag of Tricks #3. There is no World War Wednesday stream today, but it will be returning next week as normal.

Rejected Titles for this dev diary:

It’s pronounced YA-PAN

Glorious Nippon Focus Tree folded 1000 times

We’re not making this focus tree because we like you or anything

While you were waiting for dev diaries, we studied the blade

This focus tree makes our hearts go doki-doki

Girls und Schwerpunktbäume

Basically Sengoku 2

The Emperor demands Focus Trees

That wasn’t even the Focus Tree’s final form

FIXED: Japan’s Focus Tree no longer a Shameful Display

Samurai Communists are the best Communists

No Kaiju were harmed in the making of this Focus Tree

Japan 2.0

Japan Digital Remastered Edition

Japan HD Edition

Japan: Online Tactics Advanced
 
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Why not allow players to surrender when they please? I can understand the AI part and that is fine but why not make an option in decisions for the player to sue for peace or surrender unconditionally for everyone. Also if China takes Manchuria and Korea will they capitulate Japan?

That's exactly what they wrote in the DD, that they made it optional for players through a Decision :p

Speaking of taking Japan: AI Japan will now surrender if they have been nuked twice or lost Manchuria and Korea when they aren’t holding any territory in China. A player has the option through the same decision but can, of course, choose to fight to the bitter end (the AI is simply scripted to always pick the decision as soon as possible).

View attachment 324961
 
So you can force Japan to surrender by only nuking their home land twice without occupying Manchuria and Korea? That sounds weird for me as I believe the invasion of Soviet Union was also the major reason that Japan decided to surrender.
 
Is there an infrastructure multiplier that determines the movement bonus bicycle troops can get. In Malaya the bikes worked thanks to key roads.
 
About bicycle battalions:

I guess many nations employed them. For example Hungary had many of them and they were used widely. (They were used in Transcarpathia, in the invasion against Yugoslavia, and on the Eastern Front...)

So this type of infantry shouldn't be exclusive for Japan only.

Edit: and yes their speed effectiveness is greatly affected by road quality.
 
Just a though - if Japan is programmed to surrender when it loses all Korean and Chinese territory, what will happen if they switch ideologies/release these countries. If Japan only controls the mainland at the start of a war does that mean they will surrender instantly?

Also, if they choose a surrender decision can the other countries still take over Japanese mainland territory or just their colonies?
 
You still need air superiority over Japan. Which means fighters in range. Which means a base in range or a lot of carriers.

True, don't doubt that the desicion by itself i wrong by anyway, just that the nuclear weapon affects the surrender process should be a mechanic that sort of should work the same for every country. Not that I know how it works now with the scrapped National Unity is scrapped. I just seams wrong having a quota of nukes for a insta win. Say Japan goes the north way and defeats SOV and is very very strong and then later war with the allies who gets airsup. over mainlan jap and then surrenders becouse of that, even if they are undefead in the whole asia.

Why not just having nuclear detonations on coreland affect war support and stability, whose inturn affect the surrendering threshold. I guess it probably works this way anyway.

Anyway just wanna say i like how the game progresses overall.
 
*cuddles the new Japanese focus tree* :D

But ... I am also worried about the surrender options. Let's assume, Japan controls most of Asia. Then a player throws two atomic bombs on Tokio, so Japan will surrender? Or will it happen after Japan only has their core regions left and then just need two atomic bombs to surrender? If they lost their territory and puppets on Asian main land, will they surrender, even if they have Taiwan and other isles under control?
 
Hello, and welcome to the first dev diary of 2018!

Although considering today’s topic perhaps we should call it the last dev diary of the year Heisei 29 (which ends on January 8th).

When we decided to expand on China for Waking the Tiger, we also decided that we would need to take another look at the Japanese focus tree and maybe do some minor rework and some alt-history expansions. While we were basically happy with the existing German focus tree, we felt that Japan might need a somewhat more extensive rework, so we asked our QA to compile a list of issues they had with the existing tree.

QA noted the lack of flavor and interesting choices, as well as the lack of really unique gameplay. Their final recommendation was fairly short:

Burn it down. All of it.

So we did.

View attachment 324962

As you can see, we have expanded the focus tree somewhat in comparison to the old one. The choice between striking north or south was a single focus each in the old tree, but has now been expanded into a full branch.

The first basic choice is what to do with the Kodoha (“Imperial Way”) faction in the military. This faction wanted to remove the last remnants of civilian government and restore the Emperor to his rightful place (i.e. a figurehead while the military has the actual power, as things were before the Meiji Restoration of the 19th century). Historically, supporters of this faction launched a coup in February of 1936 which failed within days as the rest of the military refused to support it.

For reasons of transparency and playability, we decided to not have the coup be an event that fires on or around a set date but made the choice of whether to support or purge the Kodoha faction part of the focus tree. Purging the faction sends you down the historical path to attack China, strike south and attempt to seize the European colonies for their resources.

As you can see, we decided to make Japan form its own faction in the historical path instead of having them join the Axis. The cooperation between Japan and Germany does not fit neatly into our current faction system. While Japan did join the Tripartite Pact, it did not join the war against the Soviet Union, and indeed the Germans concealed preparations to attack the Soviet Union from their Asian allies. While there was some military cooperation and exchange of technical know-how, it wasn’t anything like the scale to which the Western Allies cooperated and indeed closer to the military cooperation between the Western Allies and the Soviet Union.

Still, it is a historical fact that Japan joined the Tripartite Pact, and as such you can do so in the historical path. But instead of joining the Axis faction, it creates a set of mutual guarantees between Germany, Italy and Japan. Should either of them be attacked instead of being the aggressor, they can be called into each other’s wars (and frankly, that is a lot closer to the relevant Article 4 of the treaty).

While still not perfect, we believe that this solves more problems than it creates. In particular, it means that Germany isn’t considered to still be fighting until Japan is taken (which led to amusing side effects such as the Luftwaffe forming the Legion Pekingente and evacuating to Japan when Germany falls). Speaking of taking Japan: AI Japan will now surrender if they have been nuked twice or lost Manchuria and Korea when they aren’t holding any territory in China. A player has the option through the same decision but can, of course, choose to fight to the bitter end (the AI is simply scripted to always pick the decision as soon as possible).

View attachment 324961

Simulating the war in China itself has come with its own challenges. We wanted to make the war feel like the long campaign it was (lasting, historically, from 1937 to 1945), not least because a Japan with a secure China can bring far more resources to bear on other targets than it did historically. At the same time, China starts with crippling penalties to its army, which means that Japan could easily defeat them. This is not particularly historical, as the Japanese expected a quick victory and were rudely surprised as the Chinese divisions fought very tenaciously.

So in order to make the campaign in China feel historical and give the Chinese player a chance to survive the initial invasion, we gave Japan some penalties for fighting in China (or, specifically, when fighting against Chinese troops). These penalties can be reduced through decisions, which raise world tension, so you will have to balance out the need to finish the campaign fast against raising world tension too quickly. We feel that this best represents the disdain the Japanese military held their opponents in - the Chinese simply weren’t worth a proper effort. Of course you, as the player, can hound your military into actually taking this conflict seriously, but the rest of the world may not like the idea of all-out warfare in China.

If you decide to side with the Kodoha faction, you effectively decide to strike north against the Soviet Union (as many in the Kodoha faction believed that the Soviets were the bigger threat). Subsequently, you will have to do some diplomatic maneuvering to keep your southern flank secure: Where historically the Japanese signed a Non-Aggression Pact with the Soviet Union while they were engaged in China (at least in part because the Battle of Kalkin Gol revealed some serious shortcomings in the Japanese military) to secure their northern flank, now you will have to sit down with the Western powers to ensure they will stay out of your hair while you deal with the Soviet Union. The London Naval Treaty reduces your dockyard output quite dramatically, but should serve to keep the Allies happy enough to look the other way when you go to war with the Communists. You will also have to send some equipment to your Manchurian “ally” to enable them to actually be somewhat useful in the war.

Later on, you can join a technological exchange program with Germany and even gain access to German Rocketry. Going down this path will also allow you to prospect for resources in Siberia.

But of course, you don’t need to follow history quite so closely. The democratic branch assumes that there could have been a significant pushback against the militarization of Japan from forces inside the civilian government. After all, Japan did have a functioning system of democratic elections and a working parliament during the Taisho period, a mere 10 years before the start of the game.

However, the militarists will not go quietly and will rather flee to Manchukuo than to surrender their position. Those elements of the army that can’t or won’t go abroad will start a civil war. Once that has been dealt with, you can rewrite the constitution to turn the Emperor into more of a constitutional monarch like the Europeans have. Afterwards, you can either try to reach out to the British and revive the Anglo-Japanese Alliance that has served so well during the beginning of the 20th century, or you can form your own West Pacific Treaty Organization (or WPTO).

But that still leaves the problem of Manchukuo, now firmly run by the Kwantung Army and supported by the very militarists you kicked out of the country. You will have to go and remove this threat to your freedom with some good old fashioned liberty bombs. From there, you can go and ensure that the colonial powers actually make good on their promises of freedom and self-determination for the native people. After all, if you can have a functioning democracy, why can’t the rest of Asia?

View attachment 324960

Finally, there is the communist branch, which is not quite as far fetched as it may seem. Historically, Japan experienced the same rise of leftist agitation as the rest of the world, and the Japanese Communist Party enjoyed some successes until new legislation effectively banned it. Extensive measures by secret police agencies ensured that by 1936, the party posed little threat to the establishment. That, however, does not mean that there wasn’t a potential for a revolution. A large number of young officers came from a peasant or working-class background, and many civil servants considered socialism to be the way of the future (or in any event better than the Japanese form of capitalism dominated by the huge industrial conglomerates, the Zaibatsus).

View attachment 324959

Historically, these civil servants were quickly banished to Manchukuo or “encouraged” by the secret police to reconsider their political stance. The first step towards a communist revolution in Japan, therefore, is to recall those civil servants that have kept the faith back to the homeland as well as sending a number of militarist hardliners to serve in Manchukuo instead. By arranging for a number of younger and more revolutionary minded officers to be promoted, you will also gain three very loyal and reasonably capable Generals who will definitely serve on your side in the unlikely event that a civil war should break out.

In the next step, you trigger a civil war.

Here, the decision to send the militarists to Manchukuo is both a blessing and a curse, as the Japanese holdings in China are taken over by loyalist troops - who are nonetheless unable to interfere in the civil war in the homelands. Once you have secured the Home Islands, you face another problem: The Emperor has been the foundation of Japan’s political system for thousands of years, and you have just deposed him. Your government has very little legitimacy in the eyes of the people, so you will have to rebuild their trust and stabilize the country. Only then can you go over to the Asian mainland and eradicate the pest of militarism before making common cause with either the Soviets or the Chinese Communists.

View attachment 324957

The Japanese military was famous for the poor relations between the Imperial Army and the Imperial Navy (for example, it took the Navy until 1943 to confess that the Battle of Midway hadn’t gone exactly as planned and had in fact included a minor setback). In the game, this is represented by a number of decisions about the prioritization of resources and resolving conflicts between the two parties. Each decision affects a national spirit representing the balance of power between Army and Navy, which affects things like factory output and dockyard construction speed.

View attachment 324956

Finally, as part of the rework, we decided to give Japan a bit more flavor by adding two units that are currently unique to Japan: Bicycle Battalions and Torpedo Cruisers. The former are about what you’d expect: infantry mounted on bicycles move a little faster than regular infantry but require some more resources. Although they are currently restricted to just Japan, they might end up being accessible for the rest of the world if we can find a place to put them in the tech tree. The Torpedo Cruisers were a fad in the Japanese Navy, who refitted a number of light cruisers with no less than 40 torpedo tubes (20 per broadside). Together with the Japanese bonuses to torpedo range, they can become a very terrifying force on the high seas - if you can manage to lure the enemy into a decisive surface battle.

View attachment 324955

In the process, we also fixed a small issue that pestered some fans of Japanese aviation:

View attachment 324954

Similar to the German focus tree, parts of the new focus tree will be part of the Waking the Tiger DLC. While most of the new focuses are free, the communist and democratic branches of the political part will be paid.

We will continue to rework vanilla focus trees in future DLCs (assuming, of course, that this meets with approval from the community), with an eye to which countries make sense with the overall theme of that DLC (for example, reworking the Soviet Union doesn’t really fit into a naval-focused DLC). Expect further updates on future plans after the release of Waking the Tiger.

DLC focus trees will see occasional updates when necessary to accommodate new mechanics (for example, Hungary now inherits Austria’s generals if they manage to form Austria-Hungary) but probably won’t see major reworks.

That is all for today. Tune in next week, when we open up Bag of Tricks #3. There is no World War Wednesday stream today, but it will be returning next week as normal.

Rejected Titles for this dev diary:

It’s pronounced YA-PAN

Glorious Nippon Focus Tree folded 1000 times

We’re not making this focus tree because we like you or anything

While you were waiting for dev diaries, we studied the blade

This focus tree makes our hearts go doki-doki

Girls und Schwerpunktbäume

Basically Sengoku 2

The Emperor demands Focus Trees

That wasn’t even the Focus Tree’s final form

FIXED: Japan’s Focus Tree no longer a Shameful Display

Samurai Communists are the best Communists

No Kaiju were harmed in the making of this Focus Tree

Japan 2.0

Japan Digital Remastered Edition

Japan HD Edition

Japan: Online Tactics Advanced
What happens if China manages to take their lands back while at war with Japan? Will they capitulate,giving china everything they have,will they sign a white-peace or will japan just return their core states?

EDIT: Please tell me you reworked the 'secure china' focus so it doesnt give a wargoal for Shanxi to Japan..
 
Not true, actually. The USAAF used a modified Dauntless (no arrestor hook) as the A-24 Banshee.

I stand corrected. However, the rest of what I said is true, two departments with separate contracts. from wikipedia:

The U.S. Army Air Force had its own version of the SBD, called the A-24 Banshee. It lacked the tail hook used for carrier landings, and a pneumatic tire replaced the solid tail wheel. First assigned to the 27th Bombardment Group (Light) at Hunter Field, Georgia, A-24s flew in the Louisiana maneuvers of September 1941. There were three versions of the Banshee (A-24, A-24A and A-24B) flown by the army to a very minor degree in the early stages of the war.[4] The USAAF used 948 of the 5,937 Dauntlesses built.
 
I can't believe you including this overexxagerated fact that the nuclear bombs made Japan capitulate... thats just not true and has been proven wrong again and again.
The invasion of manchuria and the threat of a soviet invasion on the not yet prepared coastlines in the north had already led to resolutions in the japanese cabinett to surrender, the atomic bombs whre completely trivial.
The Soviet Union had almost no naval invasion capability and this was relatively well known. The Soviets could have failed their attack and still left the same mark, as the important part of the Soviet invasion of Manchuria was that they declared war on Japan, thereby ruling out Japan's hope of using the USSR as a mediator to get a more favorable peace deal. It's hard to attribute the Japanese surrender to any one factor, especially given how much was happening in so little time, but to completely write off the atom bombs is as much of a mistake as to say that the atom bombs alone or the defeat of the Kwantung Army alone caused Japan to surrender.
 
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"I think the term is inappropriate, but the atomic bombs and the Soviet entry into the war are, in a sense, divine gifts. This way we don't have to say that we have quit the war because of domestic circumstances." - Adminral Mitsumasa Yonai breifing Emperor Hirohito on August 12th 1945

Perhaps a misclick on the Surrender Now / Continue the War Choice...

Also the example picture for the Philippines democracy event follows the time honored "Hungary demands Hungary cede Hungarian territory" model...
 
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Banzai! Banzai! Banzai!

Time for a sashimi and saki lunch.
 
This might be unpopular. Were there entire divisions of bicycle infantry in WW2? Because if not, bicycle battalions are kinda silly in a game of this scope. I think it opens a can of worms. Motorcycle troops? Ski? Dogsled? How many do we need?

Well, the German Army used bicycles extensively as "Füsilier" Bataillons or as Part of recon and cavalry units.
 
Perhaps Britain should be given a similar unconditional surrender if nuked by the Axis twice?
I partially agree, this needs a reworking go with every country. The British and Japanese resilience is to be very well noted, but this decision creates a clear distinction between the two.

To me a system where any nation should have a minimum percentage of its core VP nuked to be able to take that decision (and make the AI always take it when possible) would be a more desirable solution.
That, or making every nuked VP count as a lost VP, while also lowering the surrender limit.

I assume getting nuked will now severely damage a country's war support (and stability as well, I'd hope, although not nearly as much as WS), but even so, nukes would still be incredibly underpowered for their political and industrial/R&D repercussions, EXCEPT for Japan, which makes this decision, imho, a double wrong, not a right.
 
Given the historical way Japan actually surrendered, I feel it could be better for historical flavor to have the AI pick surrender from a 50/50 chance. Since afterall, half of the Japanese war cabinet voted to keep fighting after the 2nd nuclear strike, and only surrendered upon the emperor's intervention (Though there's more after that, it's what's relevant atm). There could be an event to signify the Emperor is the reason they chose to surrender, because otherwise the Japanese military were not in a position to have voted to surrender at all.