Just watch Akira Kurosawa's Ran instead
It also has a strong anti-war, "war poisons everything" message, but is in all respects a much superior movie. (and is, in my opinion, one of the greatest films ever made.)
Really the only good thing about Warlords was that the cinematography was pretty nice, otherwise it was a pretty lackluster hollywood-action film trying to sound like it's "historical."
4/10