Answer:
The fight with the monsters and dragons makes it a mythical battle.
Step-by-step explanation:
Beowulf is an epic narrative that tells the heroic deeds of the protagonist Beowulf. This epic narrative tells of the life of Beowulf and how he came to save the Geats from the monstrous Grendel and his mother.
Myths are those stories of legends that tell the heroic deeds of the human and his victory over the gods, demi-gods, and other supernatural elements such as monsters. In that sense, Beowulf is also a myth in that he battles the monster Grendel and his mother, and also fought against a dragon. The presence or involvement of the monsters and dragons made it a mythical story.