Whats the difference about this battle and the one fought between Beowulf and Grendel?

Solution:

Grendel is a monster that seems to embody evil. He is given no definite shape and very little personality. He seeks to destroy. He kills without mercy. He cannot be reasoned with. In a scene in which he kills thirty sleeping men, Grendel is described as 'insensible to pain and human sorrow.' He is a 'God-cursed brute'. Why would Grendel do all of this? There are a few possible reasons. Hrothgar, the king of Heorot Hall, which is the place Grendel keeps attacking, believes that Grendel is just evil by nature. Grendel is called a 'fiend out of hell' and a 'banished monster.' This is how most of the characters in the story understand Grendel. Monsters are destructive - it's just what they do. But there is a more sympathetic way to understand him.

Grendel has lived in the same place for a very, very long time. Hrothgar is new to the neighborhood. When Hrothgar built his mead hall, which is like a castle, he brought a lot of very noisy people to the area. They used the natural resources and disturbed Grendel, and so Grendel got mad (lines 86-90). Not only were the neighbors too noisy, but they sang songs that reminded Grendel about his status as an outcast. He is a 'banished monster' who is 'cursed,' which means that God has rejected him. And all day and night, Hrothgar's people sing about God (lines 90 - 114). One way to understand Grendel is as an outcast who feels harassed by Hrothgar and his people. No matter how Grendel's motives are explained, he poses a threat to Hrothgar and everyone else at Heorot Hall.

Beowulf is the hero of the story who comes to Heorot Hall to save Hrothgar and his people from the monster, Grendel, who has killed many men.