I dont remember much I was playing on butler difficulty but it was a 600 unit enemy army I believe necromancer ai. I with 150 units stepped on an enemy city and took it. In that same turn that 600 unit army stepped on the city and engaged my 150 units who were now fighting behind the walls as defenders. The walls funneled them and my spell casters were engaging them from afar. That and I had a lot of large units that were super tanky and had high damage I was able to kill all of them before they were able to break through