According to Downham, the departure of Ragnall and his contingent of warriors may have emboldened Niall Glúndub to try to expel the Uí Ímair from Ireland once again. In 919 Niall led a coalition of northern Irish kings south to Dublin. The forces of Sitric and Niall met near Islandbridge in modern-day County Dublin (dated 14 September by the "Annals of Ulster"). The resulting Battle of Islandbridge was an overwhelming victory for Sitric and his forces, with Niall falling in battle alongside one of his kinsmen. Five other kings, and a kinsman of the ruler of the Southern Uí Néill, also died fighting against Sitric's army.