In beowulf, why does beowulf sail with his chosen companions to hrothgar’s kingdom?

Beowulf goes to Hrothgar's kingdom to try and defeat the monster.

Beowulf was a hero of the Geats. He sailed with his chosen companions to Hrotgar´s kingdom because the Hrothgar's mead hall was under attack by a monster known as Grendel.

 Explanation:

Grendel is an ogre who lives in the wilderness outside their village,Grendel, an ogre who lives in the wilderness outside their village. He kills Hrothgar's men with little trouble because he is immune to human weapons. Grendel attacks the Danes because of their arrogance and his jealousy. As a monster, he is forever barred from human society. But also, to my mind, the only reasons for his actions are animal motivations: hunger, protection of his territory, fear of outsiders and pre-emptive strike, as It is clear that the Danes are intruders in Grendel’s environment.

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that is the wrong

i suggest it is anadiplosis