Brigades. The canal was defended by the 5th Mounted, the New Zealand Mounted Rifles Brigades and the 5th Light Horse Regiment. Sustained fighting began in the early hours and by about 11:00 on 4 August, the Austrian, German and Ottoman force had pushed the two Australian brigades back to a point where the 52nd (Lowland) Division in their trenches were able to attack the attackers' right flank, and the New Zealand Mounted Rifle and 5th Mounted Brigades arrived in time to extend the Australian Light Horse's line. The Ottoman advance was stopped by the combined Allied fire from the infantry and mounted troops, deep sand, the mid summer mid day heat and thirst. In mid summer desert conditions, the British infantry were unable to move effectively to pursue the retreating columns the next day and alone, the Anzac Mounted Division was unable to attack and capture Von Kressenstein's large force which made an orderly retreat to Katia and eventually back to their base at Bir el Abd. Bir el Abd was abandoned on 12 August 1916 after fierce fighting, during an attack by the Anzac Mounted Division on 9 August, at the extremity of British Empire lines of communication. This was the first substantial Allied victory against the Ottoman Empire in World War I, ending the Defence of the Suez Canal campaign. The Canal was never again threatened by land forces during the remainder of the war. The Allies then went on the offensive for seven months, pushing the Ottoman Army back across the Sinai Peninsula, fighting the Battles of Magdhaba and Rafa before being stopped on Ottoman soil in southern Palestine at the First Battle of Gaza in March 1917. Arab Revolt In early June 1916, the Sharifian Army of Sherif Hussein, Amir of Mecca, launched attacks on the Ottoman garrisons in Mecca and Jeddah in the south western Arabian Peninsula. Jeddah fell quickly allowing the Royal Navy to use the port. Fighting in Mecca lasted three weeks. A large Ottoman garrison held out at Taif until late September when they capitulated, while Sherif Hussein's third son Feisal attacked the Ottoman garrison at Medina. The British were keen to extend the Arab Revolt by destabilizing sections of the Ottoman Empire through which the Hejaz Railway ran north – south, from Istanbul to Damascus and on to Amman, Maan, Medina and to Mecca. The railway, built with German assistance to