I've played the battle of Trebia a half dozen times now as the Carthaginians and my experience with elephants varies. Sometimes they trample everything in sight and other times they spook and run amok. I can't quite figure out what causes them to go nuts. I've also noticed that if you get their charge stopped they won't go down easy, but they also don't seem to do much damage. It's all about the cccchhhhhhaaaaaaaaaaarrrrrrggggeeeeee!!!!!!!