First off love the map, big fan of setting up the crossfire with my thunderers. However, AI doesnt seem to know how to attack the gate, I was just able to hold off 3 armies with a level 2 garrison because none of their trolls/cav/giant ever attempted to attack the gate. Their catapult hit it on accident a couple times. I don't entirely mind because slaughering 5000 greenskins is always fun, but I suspect that's not intended behavior.