His best and most daring work, however, has been done when he has been "solo" flying. It is true that he attributes most of his success to "luck," but his comrades know that more than luck is needed to bring an airman safely out of some of the awkward situations in which he has been placed. On the 24th April, 1917, he was climbing slowly against the wind a few miles east of Monchy when he saw an enemy two-seater busily making observations of the Allied line and sending wireless messages to the German headquarters in the rear. He dived at the big machine, firing in bursts from his Lewis gun as he went. But his gun jammed and he was compelled to wheel round, tinkering with the weapon as he flew. In a few moments he had remedied the trouble and banged fifteen more shots at the enemy; but again his gun jammed, and before he could clear it the big German had escaped. When he got the gun into working order again he flew eastward towards Vitry, hawking the air lanes for other opponents. Before long he observed another two-seater, also on observation work. This time he tried his gun at long range, then rushed at the enemy, firing in bursts as he charged. The German machine wriggled, flying first one way then another, with the Canadian hanging on at its tail and spouting gusts of bullets at it in short intervals. Hit at last in the fusilage, the German made a dive for earth. Swift on the track of the two-seater came the captain, firing all the way; and when the German machine finally landed in a meadow he finished the remainder of his ammunition drum into it as it lay on the ground. Neither pilot nor observer climbed out. Both had been killed as they sat in the 'bus. Ten minutes later, after he had recharged his gun, Bishop climbed into the clouds to continue his cruise of the front line. As he rose he saw, away ahead, a British Nieuport being attacked by three Albatross scouts. He flew to his compatriot's assistance, and, coming up from behind, emptied his gun into one of the enemy. The German collapsed and went down like a stone. The Nieuport by this time had started in pursuit of one of the other Albatrosses, which was trying to escape, so Bishop tackled the third. A few buzzing, manoeuvring circles, a few bursts from the deadly little gun--and the German was diving steeply to earth. Captain Bishop slid down in his smoking wake and saw him crash, a heap of broken spars and flames.