Grendel is jealous of the people celebrating in Heorot. The warriors sing and make merry in the mead hall until one night Grendel decides to attack. Under the cover of darkness, while the warriors are asleep in a drunken stupor, Grendel attacks, and the monster takes away thirty men. The monster’s aim is to feed on the bodies.
He attacks again on the next night and every subsequent night until the mead hall is abandoned. Grendel is driven by evil, and he seeks to disrupt the Danes' way of life and cause them lasting torment. Grendel ensures that the feud lasts for a long time, and all attempts by the Danes to fight or appease him are met with increasing hostility. The monster is only interested in bringing death to the people.
How the monster relished his savage war / On the Danes, keeping the bloody feud / Alive, seeking no peace, offering / No truce, accepting no settlement, no price / In gold or land, and paying the living / For one crime only with another.