The order would be:
Beowulf sets out on his journey for Daneland.
Hrothgar welcomes Beowulf.
Beowulf waits for Grendel to attack Heorot.
Beowulf succeeds in defeating Grendel by tearing off his arm.
Beowulf fights with Grendel’s mother.
Beowulf sets out for his fight with the dragon.
Beowulf sets out for his Geatish homeland.
Some prefixes are pre, post
so what Iducky22 is pretty much saying is d would be the answer for e2020