I played one mission with huge armies. I gathered an army of 150 priests, 500 archers, 400 warriors (they were often defeated), and 200 bears (divided into two squads) + a light mage hero with a
ballista dealing 2000 damage. Once, I encountered an army of 200 titans. I used both bear squads to cast the Energy Rune and stun the titans, because with seven cells before the attack and the Soldier's Luck skill, it's an 88% chance of stunning, plus Haste, so the titans simply didn't attack at all.