I assume that I am just dense, but I am having difficulty understanding how the combat system works. In a recent game, I attacked an enemy city defended by two squads with respective defence ratings of 22 and 32. In my stack I had a couple of archer units - I cast Beserk on both of my archer units providing respective attack ratings of 30 and 40. Neither of my archer units could hit the two enemy squads. Can someone explain to me the math behind the combat system? At the moment, I am completely confused.