1915–1916 On 15 February 1915 he was finally accepted into basic training to learn how to fly. He trained at St. Cyr and then at Le Crotoy on a Blériot Penguin, a reduced-wingspan "flightless" version of the famous
Blériot XI aircraft that gave the sensation of flying while still on the ground. He completed his pilot training in May 1915 and then flew
Caudron G III in which he was flying a single-seater, probably against No. 56 Squadron. September and October added four victories apiece to Fonck's score. Thus, by year's end, he had raised his tally to nineteen, was commissioned an officer, and had received the ''
Légion d'honneur''. , showing the elevated
intake manifold to clear the 37mm cannon mounted in the "vee" between the cylinder banks. Fonck got only better. Known for his clinical professionalism, he applied mathematical principles to combat flying, and his engineering knowledge regarding the capabilities of the aircraft he flew was unsurpassed by his fellow pilots. Fonck took few chances, patiently stalking his intended victims from higher altitudes. He then used
deflection shooting with deadly accuracy at close range, resulting in an astonishing economy of ammunition expended per kill. More often than not, a single burst of less than five rounds from his
Vickers machine gun was sufficient. His preferred method of aerial combat was not to engage into dogfights, but to carry out surgically merciless executions. He was also reputed to be able to spot enemy observation aircraft from very far away, where most other pilots would have perceived nothing. Fonck, like France's leading ace, Captain Guynemer, flew a limited-production
SPAD XII fighter, distinguished by the presence of a hand-loaded
37mm Puteaux cannon firing through the propeller boss. He is apparently credited with downing 11 German airplanes with this type of armament, called a
moteur-canon. This was made possible by the gear-reduction version of the
Hispano-Suiza V8
SOHC engine first used in that model of SPAD fighter. It offset the now-hollow propeller shaft above the crankshaft axis, and the 37mm cannon was mounted in the V space between the two rows of cylinders. Fonck would later fly the highly successful
SPAD XIII, He did not add to his tally sheet until 19 January 1918, when he scored a double victory. February added another five, March seven more, and another three in April. Between 1600 and 1605 hours, he shot down three enemy two-seater reconnaissance planes. A couple of hours later, he repeated the feat. Understanding the importance of reconnaissance planes, with their potential to direct intensive artillery fire onto French troops, Fonck concentrated his attention upon them; six shot down within a three-hour span proved it. Another success two days later and two on 5 October put his score at 69, very close to the 72 of Major
William Avery Bishop, then the leading Allied ace. On 30 October, he matched Bishop with three more victories. He shot down two more the following day, and another the day after that, finishing with 75 confirmed victories. However he and he alone carried the flag of the French Air Force at the victory parade on the Champs-Elysées. ==After the war==