"This way! This way!" suddenly ordered the lieutenant. "Into the woods!"

Jimmy saw a large grove of trees on his left. He turned toward them, and he noted that Franz and Iggy were ahead of him, while Bob and Roger came in the rear.

And, just as they reached the somewhat sheltering woods, there sounded from the air above them several explosions, and with them was an undercurrent of humming and droning as if from a million swarms of bees.

"The Boche aëroplanes! They're right over us—a whole flock of 'em!" cried Roger. "And they're dropping bombs on us!"

CHAPTER XVII

A BATTLE OF THE AIR

What Roger had said was only too true. The advance of the American army had been halted, at least temporarily, by a sudden attack from a large number of German aëroplanes. The Fokkers had arisen from far enough back of the place where the American shells were falling to escape them. And then they had sailed directly over the advancing Americans, the center formation of the Huns' ships of the air being almost directly over where our five heroes were now stationed in the woods.

"Bombs! I should say so!" cried Jimmy, as one landed on the other edge of the woods, and blew a great hole in the ground. "This is getting too close for comfort!"

The German machines, having flown from the direction of their own lines across the American front, dropping bombs that did great execution, were now coming back again, to repeat the performance, it was very evident.

"Why didn't we bring up some anti-aircraft guns?" demanded Bob, as though some officer, immediately over him, had neglected this precaution.