In 1013, Brian led a force from his own province of Munster and from southern Connacht into Leinster; a detachment under his son, prince Murchad ravaged the southern half of the province of Leinster for three months. The forces under Murchad and Brian were reunited on 9 September outside the walls of Dublin. The city was blockaded by Brian's fleet, but it was the High King's army that ran out of supplies first, so that Brian was forced to abandon the siege and return to Munster around Christmas.