In January 2003, the British government announced that the 1st Armoured Division would be sent to the Persian Gulf for potential operations in Iraq. The division units would be the 7th Armoured Brigade, 3 Commando Brigade, and the 16 Air Assault Brigade with the 1st and 3rd Battalions, Parachute Regiment and the 1st Battalion, Royal Irish Regiment. The invasion began on 19 March. The battalions' first objective was to secure the Rumaylah oilfields before heading north to secure the main supply route north of Basra. By the end of the month, the 3rd Battalion had entered Basra unopposed. The other two battalions crossed the Euphrates River and occupied El Qurna. As the fighting ended, the 1st Battalion occupied Maysan province and Al Amarah, less one company sent to Baghdad to secure the British Embassy. By July, the 16 Air Assault Brigade had returned to Britain.