Well, first of all reinforcements are essentially worthless in this game. Don't count on them for anything. If you want to do a 4000 vs. 1000 in an SP campaign, I would advise you just hit auto-resolve or you are going to have a very hard time fighting it yourself.

Second of all, the Mongol units are superior in every way to the Japs, so basically use massive superior numbers and good defensive positions. That's all the advice I can give you.

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Khan7