constructed to burn refuse by stacking used bully beef tins filled with sand. During this period men had to patrol constantly despite poor diet, severe weather conditions, little shelter from the sun and very few rest periods. During May 1916 Ottoman aircraft flew over the Suez Canal dropping bombs on Port Said which caused 23 casualties. On 18 May, the Ottoman occupied town and aerodrome at El Arish was bombed by order of Colonel W.G.H. Salmond, commander of the 5th Wing, in reprisal for the first Ottoman raids, and on 22 May the Royal Flying Corps bombed all camps on a front parallel to the canal. By the middle of May the railway had been completed to Romani, making it possible to bring up enough stores and equipment to deploy the 52nd (Lowland) Division there. As soon as they arrived they began to dig trenches in the sand, creating a defensive line with redoubts from Mahemdia near the Mediterranean coast, south to Katib Gannit a high point in front of Romani. Ottoman Army units retaliated to the increased British Empire presence at the beginning of June, with the first of many air raids on Romani killing eight troopers from the 1st Light Horse Brigade and wounding 22. About 100 horses were also lost. At this time the forward Ottoman air base was at Bir el Mazar, east of Romani. Sinai reconnaissances May and June 1916 Early reconnaissances by the ANZAC Mounted Division covered considerable distances from Romani as far as Oghratina, to Bir el Abd and Bir Bayud. The longest raid was made on 31 May 1916 by the New Zealand Mounted Rifle Brigade to Salmana, covering in 36 hours. After the middle of May and in particular from mid June to the end of July the heat in the Sinai desert ranged from extreme to fierce. Even worse for the British were the Khamsin dust storms which blow once every 50 days for a few hours or several days, turning the atmosphere into a haze of floating sand particles flung about by a hot southerly wind. The ANZAC troops and their commanders, unused to the conditions, suffered considerably from heatstroke and thirst during these early patrols. One such patrol, returning during the hottest part of the day after a sleepless night far from base, and very little water, suffered casualties of 160 men who collapsed from heat exhaustion. An