The Four Years War and the fall of the Teutons
The last war of Brandenburgian aggression against the Teutonic Knights had been planned years in advance--Albrecht had been saving up his funds all through the 1470s after the Centralization Crisis of '74. At the beginning of April, 1481, he was told by Estavao that the provisions in the treaty signed at the end of the 2nd Polish-Teuton war was soon to be up. This time, however, Poland would not take all the spoils.
There was one major difference between this war and the last: while the 1st Northern War (a war of aggression in which Novgorod and Muscovy annexed Estland without any Swedish interference) led to a reforging of the historical Teutonic-Livonian alliance, the Teutons had also signed an alliance with Bohemia, the rival of the emperor and the rival of Brandenburg. In spite of, or perhaps because of Albrecht's support of Bohemia in the college of electors, a war with a potential Emperor was not something which Albrecht particularly wanted. To combat this potential threat, Albrecht went to the two arms of his Great Power policy: the Army, and his allies. The army had recently been retrained in the use of Pike warfare, an import from Italy, and was expanded by 2000 pikes and 1000 horse. With regards to his allies, Albrecht turned to Bavaria.
The beginnings of military talks between Margrave Albrecht's and Duke Maximilian's generals
Bavaria had been Brandenburg's ally since the 1450s, however this alliance had never been tested. The coronation of the new Duke Maximilian gave Albrecht the perfect chance to start military talks with the country's government. Military talks about the correct tactical use of pikes started in mid-April of 1481, with Helmut Von Hohenlohe, Brandenburg's Marshal and the head of it's officer school, presiding. The other major subject would be how the two armies would react in the context of a defensive war against Bohemia, Austria, or Switzerland. In return for establishing the beginnings of a Bavarian military academy, Maximilian paid for a small contingent of Bavarian monks to set up a monestary in Postdam.
Now, if I weren't roleplaying, I'd totally go with Carmelites right now. That might just be my love of wine though.
Albrecht Christian I personally attended a costume party which Maximilian threw in honor of the end of the talks. The party went well into the night of July 12th, 1481. During the party, Albrecht, dressed in the garb of a pikeman, asked Maximilian (dressed as an Italian painter) about the possibility of a war with Bohemia.
"Well, we do have more men combined than Bohemia and any of its allies", said Maximilian, "and with Helmut on our side, I feel more confident already!"
"So you would join me if a war started between Bohemia and Brandenburg?", asked Albrecht.
"Why yes, I imagine that it would be a glorious war! I, the dapper young intellectual, and you, the disciplined soldier, fighting against that ghastly king of Bohemia!"
"Well, my duke, with that in mind I have a confession to make"
"And what is that, my dear Albrecht?" asked Maximilian as the clock struck midnight
"My envoys are just now reaching Konigsberg, and the treaty between my mark and the Teutonic order is up. You have your war."
At that, Maximilian turned white.
Guess who doesn't give a CRAP about stab hits?
In the end, both Bavaria nor Bohemia would be too threatened to join what would be called the 4 Years War, however this event showcases nicely Albrecht Christian I's diplomatic skill which was to be the pivotal tool of the Brandenburgers during the war. Under Frederich II's patronage, the strategy of the Brandenburgian army would be as such: the Guard would do battle with the Teutons on Polish ground, while the Vistula Armee would move quickly to take command of the siege of Ostpreussen. In practice, this made the largest section of the Brandenburger army a mere distraction to the speed of a single regiment of knights. When Albrecht discovered that this was the major strategy of Frederich II, he ordered his staff to throw the plans away, as he saw the plan as wasteful, and the generals were inclined to agree--especially considering how many of the lower ranking officers had died in the Battle of Torun.
In the beginning of 1481, however, going over the plans Albrecht noticed that the Teutonic army was staying put in Ostpreussen, and with this in mind, Albrecht planned to have the Guard stay put in Berlin, waiting to engage the northern Bohemian force, and after they were defeated, to lure out the Teutonic army. With the advantage of pikes, Albrecht thought, there was no way that his armies would lose, especially with the Elbe and Vistula as natural fortifications. Beyond this, the Vistula Army would be split in two, with a small group of cavalry led by Albrecht himself leading the siege in Ostpreussen, while the infantry would support the Poles in Danzig.
There was one thing which Albrecht did not notice, however, partially because he'd been spending the better part of 1481 in Bavaria and Brandenburg. The make-up of the Polish army had changed greatly--it was now made out of 40,000 cavalry and 5,000 infantry. This greatly changed the nature of the deal that Albrecht had with King Stanislaw. On top of this, Poland and Brandenburg's declarations of war came at the same time, making the 4 Years War not one war, legally, but 2. Since Poland had no infantry to siege Danzig or Warmia with and since Brandenburg and Poland were not legally allowed to dictate terms in concert with the Teutons, Pomerania would have to pick up the slack. And Pomerania wanted a cut of the Teuton's lands.
The deal which Albrecht cut with Duke Erick and King Stanislaw was a master-stroke, for it simultaneously got Albrecht precisely what he wanted while silencing his allies and pinning them against each other. Poland would take the city of Danzig, Brandenburg would, as always, keep Ostpreussen, and Pomerania would take Warmia as a naval base. Stanislaw agreed to this because he knew of Albrecht's aims in Pomerania, which meant that he would be able to take Warmia back later. Erick agreed to this because he had his own plans in mind.
The Partitioning of Prussia
With Bohemia neutralized and his allies sated, Albrecht took the command of the Vistula Armee. Luckily the Teutonic army moved too quickly and took the province of Torun just as the infantry Vistula Armee left it for Danzig. While this went without a hitch, a major part of Brandenburg's strategy was now ruined, as they could no longer fight a defensive war within Poland's borders. Instead the Guard would have to cross the Vistula to reach the armies of Ordermaster Walter. This was negated, however, when Walter assaulted the city of Torun, taking the city but greatly weakening their own forces. Beyond this, the Teutonic army had not yet been introduced to pikes.
Hohenlohe's strategy at the Battle of Plock was dictated by two major geographic problems--his enemy was on the other side of the Vistula, and his enemy was on a hill. However, from the perspective of the teutons, the pikes of the Brandenburgers simply looked like spears, so as the Brandenburgers crossed the river and moved up the hill, Walter charged at the head of a massive army of heavy infantry. The momentum gained by Walter's army was destroyed entirely when they fell on the pikes of the Brandenburgers, and the Knights recruited from the newly impoverished province of Neumark performed a perfect pincer maneuver, breaking the Teutonic army and forcing them into a rout. The inferiority complex which the Brandenburgers felt in the wake of the Teutonic army was then destroyed most poetically at the Second Battle of Torun. When Hohenlohe's knights caught up with the fleeing Teutonic army, they surrendered en masse, including Walter I. The Teutonic army was no more.
FULL CIRCLE!
This all occurred within the first 2 months of the 4 years war. The Livonian front was mostly fought by Poles, who's armies were capable at winning battles, if not sieges. At the same time, while the Polish cavalry weren't entering the cities, they were laying waste to the Livonian countryside. The army Kurland was broken off from its supply chain for a month, and soon the whole of the Kurlandian coast was covered in rotting fish. In order to stop this, the Livonian Order agreed to pay a tribute of 25 ducats.
This marks the horror of the 4-Years War. At least on the Brandenburger's side, only 1000 men were killed in battle, while 9000 died from starvation and disease. When Albrecht Christian I finally entered Konigsberg in the summer of 1482, he needed to start administrating the city immediately, because not only was his army starving, but the whole city was starving and diseased by a year in captivity. Albrecht needed to make the hard decision to quarantine some of his own troops with the sick of the city in order to stop what could have been an epidemic, and he arranged a constant shipment of grain to come in from Wilno to feed the people.
A year later, in the new occupational court in Konigsberg, Albrecht was met with startling news. The Polish army in Danzig had completely died from disease, and the city had fallen to Pomeranian forces. Now that Pomeranian armies occupied both Warmia and Danzig, the wily Duke Erick signed a separate peace with the captive Teutonic ruler, granting him legal ownership over all of his occupied lands and a great amount of ducats in retribution. While Albrecht realized that the Treaty of Danzig was sure to anger his Polish ally, he used the situation to his advantage and took de jure ownership on top of his de facto administration of Konigsberg.
wait, what?
The Four Years War had several major effects on Brandenburg. The most obvious was the annexation of the Teutonic Order and the gaining of East Prussia, which put the Hohenzollerns one step farther towards the title of King in Prussia. This was not the only advantage, however. The snubbing that the Poles got was placed mostly on the heads of the Pomeranians, which made war with them inevitable. The effects weren't only beneficial, though.
The state of the Brandenburger army after the 3-Years War
The war forced Albrecht to see both of the flaws in his Great Powers Policy. Firstly, with the breaking of the Bavarian-Brandenburgian alliance, Albrecht was nearly entirely dependent on the strength of the Poles, who looked ready to force him to break his only other alliance. Secondly, the war in many ways weakened Albrecht's faith in the strength of his military. The well trained and disciplined soldiers of the Mark died by the thousands to diseases which didn't care who could hold a pike or ride a horse. He would need to field an even larger army now to deal with the disgruntled nobles of East Prussia.
the state of the former Teutonic Order, summer 1483
The poles took their aggression out on the last belligerent, Meckelemburg, with an annexation which Albrecht suggested against. He was worried already about the Emperor's reaction to him taking Hinterpommern, how would the Empire react to the perception of a Brandenburger-Polish alliance carving out a sphere for themselves in North Eastern Germany?
All of the gains from the 4 Years War
edit: Firstly, I'm really sorry I couldn't get better screenshots. A lot of the events (particularly Pomerania suing for peace) took me by surprise, but at the same time I lucked out a LOT of times during this war, and I don't really want to replay it.
The last war of Brandenburgian aggression against the Teutonic Knights had been planned years in advance--Albrecht had been saving up his funds all through the 1470s after the Centralization Crisis of '74. At the beginning of April, 1481, he was told by Estavao that the provisions in the treaty signed at the end of the 2nd Polish-Teuton war was soon to be up. This time, however, Poland would not take all the spoils.
There was one major difference between this war and the last: while the 1st Northern War (a war of aggression in which Novgorod and Muscovy annexed Estland without any Swedish interference) led to a reforging of the historical Teutonic-Livonian alliance, the Teutons had also signed an alliance with Bohemia, the rival of the emperor and the rival of Brandenburg. In spite of, or perhaps because of Albrecht's support of Bohemia in the college of electors, a war with a potential Emperor was not something which Albrecht particularly wanted. To combat this potential threat, Albrecht went to the two arms of his Great Power policy: the Army, and his allies. The army had recently been retrained in the use of Pike warfare, an import from Italy, and was expanded by 2000 pikes and 1000 horse. With regards to his allies, Albrecht turned to Bavaria.

The beginnings of military talks between Margrave Albrecht's and Duke Maximilian's generals
Bavaria had been Brandenburg's ally since the 1450s, however this alliance had never been tested. The coronation of the new Duke Maximilian gave Albrecht the perfect chance to start military talks with the country's government. Military talks about the correct tactical use of pikes started in mid-April of 1481, with Helmut Von Hohenlohe, Brandenburg's Marshal and the head of it's officer school, presiding. The other major subject would be how the two armies would react in the context of a defensive war against Bohemia, Austria, or Switzerland. In return for establishing the beginnings of a Bavarian military academy, Maximilian paid for a small contingent of Bavarian monks to set up a monestary in Postdam.

Now, if I weren't roleplaying, I'd totally go with Carmelites right now. That might just be my love of wine though.
Albrecht Christian I personally attended a costume party which Maximilian threw in honor of the end of the talks. The party went well into the night of July 12th, 1481. During the party, Albrecht, dressed in the garb of a pikeman, asked Maximilian (dressed as an Italian painter) about the possibility of a war with Bohemia.
"Well, we do have more men combined than Bohemia and any of its allies", said Maximilian, "and with Helmut on our side, I feel more confident already!"
"So you would join me if a war started between Bohemia and Brandenburg?", asked Albrecht.
"Why yes, I imagine that it would be a glorious war! I, the dapper young intellectual, and you, the disciplined soldier, fighting against that ghastly king of Bohemia!"
"Well, my duke, with that in mind I have a confession to make"
"And what is that, my dear Albrecht?" asked Maximilian as the clock struck midnight
"My envoys are just now reaching Konigsberg, and the treaty between my mark and the Teutonic order is up. You have your war."
At that, Maximilian turned white.

Guess who doesn't give a CRAP about stab hits?
In the end, both Bavaria nor Bohemia would be too threatened to join what would be called the 4 Years War, however this event showcases nicely Albrecht Christian I's diplomatic skill which was to be the pivotal tool of the Brandenburgers during the war. Under Frederich II's patronage, the strategy of the Brandenburgian army would be as such: the Guard would do battle with the Teutons on Polish ground, while the Vistula Armee would move quickly to take command of the siege of Ostpreussen. In practice, this made the largest section of the Brandenburger army a mere distraction to the speed of a single regiment of knights. When Albrecht discovered that this was the major strategy of Frederich II, he ordered his staff to throw the plans away, as he saw the plan as wasteful, and the generals were inclined to agree--especially considering how many of the lower ranking officers had died in the Battle of Torun.
In the beginning of 1481, however, going over the plans Albrecht noticed that the Teutonic army was staying put in Ostpreussen, and with this in mind, Albrecht planned to have the Guard stay put in Berlin, waiting to engage the northern Bohemian force, and after they were defeated, to lure out the Teutonic army. With the advantage of pikes, Albrecht thought, there was no way that his armies would lose, especially with the Elbe and Vistula as natural fortifications. Beyond this, the Vistula Army would be split in two, with a small group of cavalry led by Albrecht himself leading the siege in Ostpreussen, while the infantry would support the Poles in Danzig.
There was one thing which Albrecht did not notice, however, partially because he'd been spending the better part of 1481 in Bavaria and Brandenburg. The make-up of the Polish army had changed greatly--it was now made out of 40,000 cavalry and 5,000 infantry. This greatly changed the nature of the deal that Albrecht had with King Stanislaw. On top of this, Poland and Brandenburg's declarations of war came at the same time, making the 4 Years War not one war, legally, but 2. Since Poland had no infantry to siege Danzig or Warmia with and since Brandenburg and Poland were not legally allowed to dictate terms in concert with the Teutons, Pomerania would have to pick up the slack. And Pomerania wanted a cut of the Teuton's lands.
The deal which Albrecht cut with Duke Erick and King Stanislaw was a master-stroke, for it simultaneously got Albrecht precisely what he wanted while silencing his allies and pinning them against each other. Poland would take the city of Danzig, Brandenburg would, as always, keep Ostpreussen, and Pomerania would take Warmia as a naval base. Stanislaw agreed to this because he knew of Albrecht's aims in Pomerania, which meant that he would be able to take Warmia back later. Erick agreed to this because he had his own plans in mind.

The Partitioning of Prussia
With Bohemia neutralized and his allies sated, Albrecht took the command of the Vistula Armee. Luckily the Teutonic army moved too quickly and took the province of Torun just as the infantry Vistula Armee left it for Danzig. While this went without a hitch, a major part of Brandenburg's strategy was now ruined, as they could no longer fight a defensive war within Poland's borders. Instead the Guard would have to cross the Vistula to reach the armies of Ordermaster Walter. This was negated, however, when Walter assaulted the city of Torun, taking the city but greatly weakening their own forces. Beyond this, the Teutonic army had not yet been introduced to pikes.
Hohenlohe's strategy at the Battle of Plock was dictated by two major geographic problems--his enemy was on the other side of the Vistula, and his enemy was on a hill. However, from the perspective of the teutons, the pikes of the Brandenburgers simply looked like spears, so as the Brandenburgers crossed the river and moved up the hill, Walter charged at the head of a massive army of heavy infantry. The momentum gained by Walter's army was destroyed entirely when they fell on the pikes of the Brandenburgers, and the Knights recruited from the newly impoverished province of Neumark performed a perfect pincer maneuver, breaking the Teutonic army and forcing them into a rout. The inferiority complex which the Brandenburgers felt in the wake of the Teutonic army was then destroyed most poetically at the Second Battle of Torun. When Hohenlohe's knights caught up with the fleeing Teutonic army, they surrendered en masse, including Walter I. The Teutonic army was no more.


FULL CIRCLE!
This all occurred within the first 2 months of the 4 years war. The Livonian front was mostly fought by Poles, who's armies were capable at winning battles, if not sieges. At the same time, while the Polish cavalry weren't entering the cities, they were laying waste to the Livonian countryside. The army Kurland was broken off from its supply chain for a month, and soon the whole of the Kurlandian coast was covered in rotting fish. In order to stop this, the Livonian Order agreed to pay a tribute of 25 ducats.
This marks the horror of the 4-Years War. At least on the Brandenburger's side, only 1000 men were killed in battle, while 9000 died from starvation and disease. When Albrecht Christian I finally entered Konigsberg in the summer of 1482, he needed to start administrating the city immediately, because not only was his army starving, but the whole city was starving and diseased by a year in captivity. Albrecht needed to make the hard decision to quarantine some of his own troops with the sick of the city in order to stop what could have been an epidemic, and he arranged a constant shipment of grain to come in from Wilno to feed the people.
A year later, in the new occupational court in Konigsberg, Albrecht was met with startling news. The Polish army in Danzig had completely died from disease, and the city had fallen to Pomeranian forces. Now that Pomeranian armies occupied both Warmia and Danzig, the wily Duke Erick signed a separate peace with the captive Teutonic ruler, granting him legal ownership over all of his occupied lands and a great amount of ducats in retribution. While Albrecht realized that the Treaty of Danzig was sure to anger his Polish ally, he used the situation to his advantage and took de jure ownership on top of his de facto administration of Konigsberg.

wait, what?
The Four Years War had several major effects on Brandenburg. The most obvious was the annexation of the Teutonic Order and the gaining of East Prussia, which put the Hohenzollerns one step farther towards the title of King in Prussia. This was not the only advantage, however. The snubbing that the Poles got was placed mostly on the heads of the Pomeranians, which made war with them inevitable. The effects weren't only beneficial, though.

The state of the Brandenburger army after the 3-Years War
The war forced Albrecht to see both of the flaws in his Great Powers Policy. Firstly, with the breaking of the Bavarian-Brandenburgian alliance, Albrecht was nearly entirely dependent on the strength of the Poles, who looked ready to force him to break his only other alliance. Secondly, the war in many ways weakened Albrecht's faith in the strength of his military. The well trained and disciplined soldiers of the Mark died by the thousands to diseases which didn't care who could hold a pike or ride a horse. He would need to field an even larger army now to deal with the disgruntled nobles of East Prussia.

the state of the former Teutonic Order, summer 1483
The poles took their aggression out on the last belligerent, Meckelemburg, with an annexation which Albrecht suggested against. He was worried already about the Emperor's reaction to him taking Hinterpommern, how would the Empire react to the perception of a Brandenburger-Polish alliance carving out a sphere for themselves in North Eastern Germany?

All of the gains from the 4 Years War
edit: Firstly, I'm really sorry I couldn't get better screenshots. A lot of the events (particularly Pomerania suing for peace) took me by surprise, but at the same time I lucked out a LOT of times during this war, and I don't really want to replay it.
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