It's a series of historical battles. Difficult battles - you really have to work to win.
There's a multiplayer mode as well. Not played it but IIRC you can set up custom battles. I don't recall if custom battles are possible for the single player game.
EDIT: I've changed the thread's title so it includes XIII Century as well, since there's a lot of content here for that game. Might attract a bit more attention.
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