Beowulf shed his armor and blood-icicle in preparation for the battle. The Spear-Danes will later learn that a brave warrior is guarding the mead hall.
"Then out of the night came the shadow-stalker, stealthy and swift;" (702-703).
Grendel, Cain's descendant, placed his hand on the iron gate and destroyed it. He looked around the hall greedily anticipating the carnage that was to ensue.
Grendel let out a vicious snarl and mauled one of the thanes. Beowulf lay watching, analyzing the monster.
"Venturing closer, his talon was raised to attack Beowulf where he lay on the bed;" (744-766).
Just as Grendel was about to attack, Beowulf caught him in an arm lock. The monster attempted to escape but he could not overpower the evil-slayer. Fingers broke and tendons tore as Grendel's arm was ripped.