aboard HMAT Afric on 18 October 1914. Street arrived in Alexandria, Egypt, in early December. After further training his battalion sailed via Lemnos to participate in the Gallipoli campaign. He participated in the Landing at Anzac Cove on 25 April 1915 as platoon commander of "D" Company. He and his men reinforced a hill named Baby 700 and succeeded in holding the position for several days. Street received a "slight" wound to the head and was evacuated back to Egypt, where he was promoted to full lieutenant with effect from 26 April. He returned a month later and led a mission on 4 June to eliminate an Ottoman machine-gun, which ended in him "unexpectedly stumbling into Turkish troops in a supposedly unoccupied 'sniper’s trench'". His sergeant on the mission Harry Freame became a lifelong friend. Street was subsequently appointed acting adjutant of the 1st Battalion and in November was promoted to captain. He and the 1st Battalion were evacuated to Egypt the following month. In early 1916, Street went to France with the 1st Battalion. He was soon seconded to the 14th Battalion where served as staff captain during the Battle of Fromelles, in charge of the 4th Brigade's report centre. He was sent to Cambridge, England, for further training in February 1917. He returned to the front in July 1917 as brigade major to Brigadier General Harold "Pompey" Elliott; he was promoted major in October. Their working relationship was poor. While Elliott described Street as "a very decent boy" and "a very lovable lad", he regarded him as constantly needing direction and overinvolved with recreational activities. He also "resented having the charming and well-connected staff officer foisted upon him" in place of one of his own men of a lower social standing. Street was finally transferred away from Elliott's staff in April 1918 following an incident in which a poorly worded order placed three battalions in danger. In early 1918 Street learned that he had been awarded the Military Cross in the 1918 New Year Honours. After his marriage in June he rejoined the 1st Battalion at Pradelles and was appointed officer commanding of "A" Company. His unit saw action in the Second Battle of the Somme as well as skirmishes at Chuignolles and Hargicourt. Street was shot in the wrist by a machine gun bullet in September 1918, and after a period of sick leave joined the Demobilisation