The Battle of Haugsnes (Haugsnesbardagi) was fought at Haugsnes, a low peninsula south of Flugumýri in Skagafjörður in Northern Iceland. The battle was fought on April 19, 1246 between the forces of Þórður kakali Sighvatsson and those of Gissur Þorvaldsson. Þórður was victorious. It was the bloodiest battle ever to be fought in Icelandic history, with about 110 casualties in total, amongst them Brandur Kolbeinsson, chieftain of the Ásbirningar. Defeat in battle lead to the end of power for the Ásbirningar family clan.