Your forces were unprepared for the attacked upon the back gate.

The first notion your men got was the smell of smoke, but by then, it was too late. The back gate was set ablaze and could not be put out, your forces mustard at the back gate, waiting for the strike, which came from the unprotected front gate!

Cluny's horde rushed in. They had slain many of your warriors before you had even noticed them!

When your forces had turned around to face the coming onslaught, more of Cluny's vermin attacked from behind. You were surrounded and were forced to surrender, or risk the lives of all the poor abbeyfolk inside.

You surrendered.