Battle of Haugsnes ( Icelandic: ) was fought at Haugsnes, a low peninsula south of Flugumýri in Haugsnesbardagi Skagafjörður, 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 family clan. Defeat in battle lead to the end of power for the Ásbirningar. 
The artist and farmer Sigurður Hansen of Kringlumýri has created a memorial for the battle at the site, consisting of more than 1100 boulders in battle order, each representing a combatant. Those who fell are marked with iron crosses.
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Árni Daníel Júlíusson, Jón Ólafur Ísberg, Helgi Skúli Kjartansson
Íslenskur sögu atlas: 1. bindi: Frá öndverðu til 18. aldar (Almenna bókafélagið, Reykjavík: 1989)
Coordinates: 65°50′00″N 23°15′00″W / 65.8333°N 23.25°W