When the giant demon attacked my fortress, I cursed.
The fort was my newest and proudest conquest, wrested from a nearby computer player. I left a small garrison, stiffened by two ballistae, to hold the walls while my main army subdued the nearby hinterlands. Now that demon, with its vast pool of health and huge spell list, was going to snatch away my prize.
The battle began. Because it was a siege, my ballistae were allowed a number of free shots. A bolt slammed into the demon. A big chunk of its health disappeared. And that was just the start.