Higher and higher it rose by swift spirals, sometimes banking over so rapidly as it turned in its circuit that those who stood watching it from below feared it had touched an air pocket. But never did fiery steed answer the touch of the huntsman's rein so quickly, and never did gallant ship, as she rode the combing waves, answer her helm more readily than did the air-wasp respond to the slightest movement of her controls this morning, as she mounted up into the dawn. For the daring and brilliant youth who held the joystick was a master-pilot, who understood every whim and fancy of his machine. And now for a while let us leave Dastral climbing up into the azure, then traversing a dozen miles behind the British lines, so as to disappear from the enemy's view until the moment came for him to hunt his prey. Soon after he had disappeared from view Major Bulford gave the order. "Squadron, prepare for action!" for this was to be a day of great things, and the Squadron-Commander himself, having now recovered from his recent injuries, was going to lead the whole of the three Flights, which composed the squadron under his command, over the enemy's lines. Within an incredibly short space of time all the machines were ready on the level stretch of grass. The bomb carriers were filled and drums of fresh ammunition were shipped. And within half an hour of the departure of the air-wasp, the squadron started off in regular formation, and crossed over the enemy's lines. The secret had been well kept. Only the pilots themselves, after they had taken their seats behind the propellers, received the whispered orders for the day. A great bombing raid was to be carried out behind the German lines with the express purpose of drawing out Himmelman and his crowd to counter-attack, while Dastral, hidden away in the clouds at 12,000 feet, was to enter the fight at the critical moment. Then the most daring air-fiends on the battle-fields of Europe were to meet in single-combat, and decide for ever to which side the supremacy of the air should be given. The whole squadron crossed the lines at 7,000 feet, and received a baptism of fire from the anti-aircraft batteries, while thousands of combatants in the trenches far below stayed their fighting for a moment to watch the stinging hornets sail calmly by, as though utterly oblivious of the hail of bursting shrapnel, which made little jets of fire and cirrus-clouds of white smoke all about them.