The narrator describes Grendel's hatred for the Danes as "pain as raw as knuckles."
Geat; Danes
Grendel terrorized the Danes for twelve years before being defeated by Beowulf.
12 years
Beowulf is a legendary hero who travels from Geatland to help the Danes by fighting the monster Grendel.
Geat; Danes
Good vs. Evil
The Danes.
Grendel is not a monster , it is a "tribe" living in pre danish "Denmark" defending their land against danes, invading from the east "sweden", it might have been rather difficult, and the danes was helped by their allied "geates"
Grendel haunts Heorot for twelve years before Beowulf arrives to help the Danes.
The battle between Grendel and Beowulf takes place in Heorot, the hall of the Danes.
In Beowulf, the Danes irritate Grendel by celebrating loudly in the mead hall Heorot every night. Grendel, who is a creature of darkness, cannot stand the noise and the joyous festivities of the humans, causing him to attack the hall and kill its inhabitants.