I some what plan on that though not on the brainwashing part since he is already fighting for the imperialists which have the idea of kicking out the westerns which they call the barbarians and maintain back the true system of the Imperial Japanese Monarchy

Simple, you just gotta research well enough and know how to write well to make a formulated understanding for the reader to be entertained.

Maybe.

oh, trust me, it won' t:)

Ah, I know it's just that. Remember, this is the early start of the story where there is more chaos and more high casualties on their side, which so will cause problems with the reassignment of troops in a company or the amount of weaponry avaliable to the company hope you could understand