The Battle of Umm Qasr was the first military confrontation in the Iraq War. At the start of the war, one of the first objectives was the port of Umm Qasr. On 21 March 2003, as allied forces advanced across Southern Iraq, an amphibious landing force captured the new port area of Umm Qasr. The assault was spearheaded by Royal Marines of the British 3 Commando Brigade, augmented by U.S. Marines of the American 15th MEU and Polish JW GROM troops. Iraqi forces in the old town of Umm Qasr put up unexpectedly strong resistance, requiring several days' fighting before the area was cleared of defenders. The port was finally declared safe and reopened on 25 March 2003.