Why does wiglaf aid bewulf in his battle with the dragon?

Wiglaf aids Beowulf in his battle with the dragon because Wiglaf is loyal to Beowulf. Beowulf had assisted Wiglaf by providing him with gold, armor, and land, and in return Wiglaf had pledged to help Beowulf whenever necessary. Although Beowulf's other servants had fled the fight, Wiglaf stayed to aid Beowulf because of the responsibility he felt towards him.