When they got Y221 back to the 'drome and overhauled her they found her wrenched a bit, but in a couple of days she was tautened up into trim and in the air again. And the very next morning, as if this weren't enough, Charger and Billy had another nerve-testing. They were up about 12,000 and well over Hunland when they ran into a patch of Archies, and Charger turned and led the formation straight towards a bank of white cloud that loomed up, solid looking as a huge bolster, before them. The sun was dead behind them, so Billy at first sat looking over the tail on the watch for any Huns who might try to attack "out of the sun" and its blinding glare. But as it was dead astern over the tail Billy could see clearly above and behind him, so that there was no chance of a Hun diving unseen from a height, and they were moving too fast to be overtaken on the level "out of the sun." Billy turned round and watched the cloud they were driving at. The sun was full on it, and it rose white and glistening like a chalk cliff--no, more like a--like a---- Billy was idly searching his mind for a fitting simile, when his thoughts broke and he yelled fiercely and instinctively in warning to Charger. But Charger had seen too, as Billy knew from his quick movement and sudden alert sit-up. The cloud was anything round a hundred yards from them, and they could just see the slow curling twisting movement of its face. And--what had suddenly startled them--they could see another machine, still buried back in the cloud, and looming large and distorted by the mist, but plainly flying out of it and straight at them.