officially qualified as an Observer on 27 August and on 15 September he worked for the first time with Canadian troops, including his old regiment. On 15 November, Barker and his pilot, flying very low over the Ancre River, spotted a large concentration of German troops massing for a counter-attack on Beaumont Hamel. The crew sent an emergency Zone Call which brought to bear all available artillery fire in the area onto the specified target. The force of some 4,000 German infantry was effectively broken up. He was awarded the Military Cross (MC) for this action in the concluding stages of the Battle of the Somme. In January 1917, after spending Christmas on leave in London, he commenced pilot training at Netheravon, flying solo after 55 minutes of dual instruction. On 24 February 1917, he returned to serve a second tour on Corps Co-operation machines as a pilot flying B.E.2s and R.E.8s with 15 Squadron. On 25 March, Barker claimed another scout "driven down". On 25 April 1917 during the Arras Offensive, Barker, flying an R.E.8 with observer Lt. Goodfellow, spotted over 1,000 German troops sheltering in support trenches. The duo directed artillery fire into the positions, thereby avoiding a counter-attack. After being awarded a bar to his MC in July, Barker was wounded in the head by anti-aircraft fire in August 1917. After a short spell in the UK as an instructor, Barker's continual requests for front-line service resulted in him being transferred to become a scout pilot, being offered a post with either 56 Squadron or 28 Squadron. He chose command of C Flight in the newly formed 28 Squadron, flying the Sopwith Camel that he preferred over the S.E.5s of 56 Squadron. Although Barker was reportedly not a highly skilled pilot – suffering several flying accidents during his career – he compensated for this deficiency with aggressiveness in action and highly accurate marksmanship. The unit moved to France on 8 October 1917. Barker downed an Albatros D.V on his first patrol, though he did not claim it as the patrol was unofficial. He claimed an Albatros of Jasta 2 (Lt. Lange, killed) on 20 October, and two more, of Jasta 18, on 27 October (Lt. Schober killed, Offstv. Klein, force landed). Italian Front 1917–18 On 7 November 1917, 28 Squadron was transferred to Italy with Barker temporarily in command; most of the unit, including aircraft, traveled by