How many men does Grendel kill?

Grendel killed one of Beowulf's men before trying to attack Beowulf himself. He suprised Grendel with a strong choke-hold. While fighting, they damaged the mead-hall extensively and Beowulf pulled Grendel's arm from his socket. The arm acted as another trophy for the mead-hall.

Grendel killed many more of Hrothgar's men.