Grindel kills one of Beowulf's men, leaving Beowulf the only fearless one. Beowulf swings his mighty sword and cuts the arm off of the beast. Grindel escapes and Beowulf keeps the arm as a trophy.
Beowulf tracks the beast to the underworld beneath a fiery lake When he arrives he meets Grindel's mother the "swamp hag". She approaches him with a dagger and soon learns her knife is no match for his armor, he removes her head swiftly and Grindel's as well to make sure he'd finally slain the monster.
Beowulf fights a dragon and is injured fatally, this frightened his men and all but one fled. This brave soldier fought and slayed the dragon leaving all the treasure to his people. Beowulf insisted on them keeping it.