Oswine refused to engage in battle, instead retreating to Gilling and the home of his friend, Earl Humwald. Humwald betrayed Oswine, delivering him to Oswiu's soldiers by whom Oswine was put to death. In Anglo-Saxon culture, it was assumed that the nearest kinsmen to a murdered person would seek to avenge the death or require some other kind of justice on account of it (such as the payment of weregild). However, Oswine's nearest kinsman was Oswiu's own wife, Eanflæd, also second cousin to Oswine. In compensation for her kinsman's murder, Eanflæd demanded a substantial weregild, which she then used to establish Gilling Abbey. The monastery was staffed in part by the relatives of both of their families, and given the task of offering prayers for both Oswiu's salvation and Oswine's departed soul. By founding the monastery shortly after Oswine's death, Oswiu and Eanflæd avoided the creation of a feud.