The AI as Scipii was besieging Croton (I'm Carthage). They brought a ram, which I thought was dumb against stone walls, I never bother with rams. But they put a somewhat depleted infantry stack on it and sent it right at the main gate. Result? There was a dead ram smack dab in the middle of the gate...no sallies through that exit, now my cavalry has to go all the way around to harass the siege tower pushers and ladder men in waiting. I thought it was a good tactic, even if by accident.