I'm trying to find an old mod I remember using. I think it was named Great War General, but I'm not too sure. It was for the vanilla game, it replaced the Great General you got from the Warrior Code Honor policy with a stronger warrior unit with 3 moves. It didn't replace all Great Generals, because, if I remember correctly, the mod author said they were new to modding the game and they couldn't figure out how to do that. I don't remember where I got it, this is about all I can remember of it.