Cluny's army struck with vicious ferocity.
The horde attacked your unprotected East Wall with grappling hooks and seige towers. By time your archers and spear handlers had seen them, many vermin were up on the battlements.
One fervent rodent unlocked the front gate, while your forces were battling the vermin on the East Wall.
Cluny and his horde marched into the abbey grounds and took control of Cavern Hole, where all the old, young, and women who did not battle were staying.
For the sake of the dibbuns, you had to surrender the abbey, and your friends, and yourself into a life of slavery under Cluny the Scourge.