Battle of Islandbridge

Battle of Islandbridge
Date 14 September 919 Location near Islandbridge, County Dublin Result Decisive Viking victory
Belligerents
Vikings of the Uí Ímair	Irish coalition: Northern Uí Néill Ulaid Brega Airgíalla Mide South Brega
Commanders and leaders
Sitric Cáech	Niall Glúndub  † Áed mac Eochocáin  † Máel Craibe ua Duibsinig  † Máel Mithig mac Flannacain  † Conchobar mac Flainn  † Cellach mac Fogartaig  †
Strength
Unknown	Unknown
Casualties and losses
Unknown	Unknown

The Battle of Islandbridge, also called the Battle of Áth Cliath, took place on 14 September 919 between a coalition of native Irish, led by Niall Glúndub, overking of the Northern Uí Néill and High King of Ireland, and the Dublin-based Vikings of the Uí Ímair, led by Sitric Cáech. It was one in a series of battles initiated by the native Irish to attempt to drive the Vikings of the Uí Ímair from Ireland. The battle was a decisive victory for Sitric Cáech and the Uí Ímair, with Niall Glúndub and five other Irish kings falling in the battle.

The ruling Vikings of Dublin, the Uí Ímair, had been expelled from the city in 902 by a joint force led by Máel Finnia mac Flannacán, overking of Brega and Cerball mac Muirecáin, overking of Leinster. However, this expulsion was temporary and Viking raids continued on Irish settlements. In 914 a large Viking fleet sailed to the previously Viking-controlled city of Waterford, and the following year more Vikings settled in Limerick, though Dublin itself remained outside Uí Ímair control. In 917 two prominent members of the Uí Ímair, Ragnall and Sitric Cáech, grandsons of Ímar, sailed separate fleets to Ireland, Ragnall landing at Waterford and Sitric Cáech landing at Cenn Fuait in Leinster. Several native Irish kings gathered forces to try to drive off the Vikings once more, including Niall Glúndub, over-king of the Northern Uí Néill and High King of Ireland, and Augaire mac Ailella, over-king of Leinster. The Vikings fought and won a victory against Niall Glúndub and the men of the Uí Néill at the Battle of Mag Femen in Brega, and then won another victory against Augaire mac Ailella and the men of Leinster at Cenn Fuait. Sitric led his men on a triumphant return to Dublin, re-establishing Viking rule and installing himself as king, while Ragnall returned to England.

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