He made the ascent with his customary brilliancy, which had won him the admiration of the entire escadrille. The air seemed to be filled with various types of planes. Some were already moving off toward the front, from which came the roar of battle, showing that already the action had begun by an intense bombardment of a portion of the German trenches which the French longed to retake.

Tom spent some little time "knocking around" while awaiting the coming of those members of the Lafayette Escadrille who were the last to leave the ground.

What is twenty or even thirty miles to a pilot in a speedy Neiuport capable of going two miles a minute when pressed? They could be over the lines in a very brief time after leaving the aviation camp.

Tom looked at the scene below him, which was spread out like a gigantic map. He never wearied of observing it when simply "loafing" up in the air, as at present. The sun was fairly above the eastern horizon, though clouds drifted along in scattered masses, and it was as yet impossible to tell what the day might bring forth.

Then the last of the squadron arrived, and the signal was given to start for the front. Away they went with a whirr and a roar, seven strong. They overtook a number of clumsy two-seaters on the way, observation planes, bombing machines, or it might be those included in the "fire-control" units going to relieve some of their kind already doing their appointed bit in the battle.

Tom looked far beyond. He could see great oceans of smoke arising that told of innumerable high explosives bursting, and enormous guns being discharged. Both sides seemed hard at work, though the French were certainly sending ten shells to one that came from the forces of the Crown Prince. This told plainly enough which army expected to do the attacking that day.

And yet while all this wonderful panorama of war was spread beneath them, the seven pilots moving onward in wild-geese formation, with the captain at the head of the V, they heard nothing of the tumult raging. In their muffled ears sounded only the loud whirr of the propellers, and the deafening explosions of the engines. It was almost as noisy as a boiler shop in full blast.

The fire-control planes were already sending back their signals, the observer aboard intently following the course of each monster shell to note exactly where it landed, and then communicating with the gunners, so they might correct their faults and make each missile count.

German pilots were in the air also, sometimes in swarms. Theirs was the task to attack these heavier machines and try to cripple or destroy them.

Of course each one of these machines of the French "relage," or fire-control, was armed with a quick-firing gun; and there was an observer aboard, as well as a deft pilot. They carried such a large assortment of material, consisting among other things of a complete wireless outfit, that they had to be built with unusually large wings.