Ailie went down in a hurricane dive on the first bomber, and since he was much faster than the big machine, especially with it carrying a full load, he caught it up rapidly, and bringing his bow gun into action commenced to hail a stream of lead on it. The gunner of the two-seater began to fire back at Ailie, but as his pilot at the same time was swerving and swinging his machine to dodge the streaking bullets, he spoiled the gunner's aim and few of the bullets came dangerously close to Ailie. But two of the enemy scouts had seen Ailie's charge, had promptly swung and dived after him, and, following hard astern, opened fire in their turn. Ailie caught up the two-seater, swooped down under her, throttled back to keep her pace, pulled down the gun fixed on his top plane, and started to pelt bullets up into the underbody hurtling along above him. The two Hun scouts dropped to his level and followed, shooting close and hard, and Ailie, finding their bullets snapping and smacking on his planes, was forced to swerve and duck and at last to turn sharp on them. Either he was the better pilot or his was the handier machine, because in a few seconds he had out-manœuvred them and driven them diving down ahead of him. He ripped a short burst into one, wheeled, looked round for sight of his two-seater and, sighting it tearing off at top speed, swung and, opening his engine full out, went racing after it. The two-seater flung himself into a spin and went twisting and spiralling wildly down, Ailie following close and shooting whenever he could bring his sights to bear. But again the renewed rattle of close machine-gun fire began, and he glanced round to find the scouts hot in pursuit again. This time they were not to be pursuers only, for another of the Flight leaped suddenly into the fight, rattled off a quick burst of fire, and in an instant had one of the enemy scouts plunging down helplessly out of control, whirled round and without a second's hesitation attacked the second. The Hun bomber, down to about 1,000 feet, flattened out and drove off east with Ailie still hard after him. He was getting angry now. Burst after burst of fire he had poured, as far as he could see, straight into the big machine, and yet it kept on apparently unharmed. But suddenly its tail flicked up, a wing buckled and tore loose, and it went down rolling and pitching, to crash on the ground.