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About 4:1. It's strength allowed my hurting fleet to heal up a few more days before sallying. I didn't think about saving and playing out the situation, to see whose army would last out. Too focused on taking out the IJN.

To be clear, I don't plan on defending all my islands with that type of force, but I might as well use my existing land forces for something while building up USA capacity.
 
About 4:1. It's strength allowed my hurting fleet to heal up a few more days before sallying. I didn't think about saving and playing out the situation, to see whose army would last out. Too focused on taking out the IJN.

To be clear, I don't plan on defending all my islands with that type of force, but I might as well use my existing land forces for something while building up USA capacity.

4:1 eh... the AI being what it is... that should have either made it 2 divisions of JAP 3MAR-1ENG attacking a plains-terrain island, 3 3MAR-1ENG JAP divisions in a jungle, or 4 divisions on a Mountain-terrain island?
 
4:1 eh... the AI being what it is... that should have either made it 2 divisions of JAP 3MAR-1ENG attacking a plains-terrain island, 3 3MAR-1ENG JAP divisions in a jungle, or 4 divisions on a Mountain-terrain island?
I loaded up the game and didn't break up any attack. Turns out I had 2 of those binary divisions each, on Guam and Wake, which were both invaded eventually. When I don't intercept the invading navy, my two INF divisions are eventually destroyed (even when commanded by Patton and Eisenhower). Each island was attacked by two marine and two infantry divisions
 
I loaded up the game and didn't break up any attack. Turns out I had 2 of those binary divisions each, on Guam and Wake, which were both invaded eventually. When I don't intercept the invading navy, my two INF divisions are eventually destroyed (even when commanded by Patton and Eisenhower). Each island was attacked by two marine and two infantry divisions
In TFH, Japanese AI is hardcoded to get Wake, Guam and Midway at all costs. If they've to use their entire army to take one of these, they'll do.
 
In TFH, Japanese AI is hardcoded to get Wake, Guam and Midway at all costs. If they've to use their entire army to take one of these, they'll do.

That is interesting. Without knowing that, I (USA) decided to put HARM-GAR-ART-AA-ENG onto those islands (plus Honolulu) and just wait and see what happens. The island divisions are led by skill-1 defensive trait generals and hold out every single amphibious assault. When JAP sends a fresh marine corps just after the previous one has given up, I send ships though to intervene, because the island division has not gathered full org again.