At the beginning of the poem, Beowulf, when Grendel attacked in the Hrothgar's hall the clear description of the fate was given. Grendel is characterized as an <em>“enemy of mankind”</em> and <em>“ grim spirit” </em>when he first attacked the hall. Upon his liar, he carried off with various soldiers to feast, and
<em>“Then he found therein a band of nobles asleep after the feast: they felt no sorrow, no misery of men. The creature of evil, grim and fierce, was quickly ready, savage and cruel, and seized from their rest thirty thanes.”</em>
The hall stood empty for twelve years because Grendel repeated his number of visits, and whoever visited that hall met the same fate as earlier. Hence, the way Grendel slaughtered the soldiers, they are considered to be brave. Therefore, nobody had the courage to defeat Grendel.