I don't have an answer, but the Japanese bit at the end is fascinating. I read a book (may have been a history of the Kokoda Trail) which discussed the Japanese soldiers reaction to being captured. The expectation was to be executed or tortured. Once it became clear this wasn't going to happen, full cooperation usually occurred as the culture and loss signified the defeat by a superior leader and force, and allegiances shifted. I have likely jumbled this a bit, but the gist of it was that the Japanese soldiers reaction to loss was quite different to the European soldiers.