"We will keep right on his tail, boys," said Brodno. "That noise behind is Fritzy starting on a raid, no doubt. If he gets too close we must either keep him back or lead him off after us." The noise of whirring propellers increased rapidly. Doubtless scouting planes were out. As a rule, they are faster than the big biplanes. In view of this, Byers presently began to mount higher, the rear plane maintaining its level with a view of attracting the notice of the pursuing Germans. Then came a spatter of machine gun bullets that rattled about their ears until Blaine, from his rear position, opened on the Boches in turn. After that the pursuit of Byers ceased, for Blaine and Brodno, with their two weapons, aided by Erwin, who manipulated a Lee-Enfield rifle, kept the three scouts busy for a time. A plane is a shaky place from which to aim a rifle, but Orris, having had much practice at the training butts, soon laid out one lone pilot and his scout went trailing guideless out of range and action. But about this time there came the heavier rumble of Archies from below, and presently shrapnel began tearing into the wings of the biplane. "Up we go, boys!" said Brodno. "I guess Byers must be well on over by now." But about this time they heard the sounds of gun spatter far up above, and mounting rapidly they saw two more Fokker scouts trailing after Byers, who not only mounted still higher, but put Pete at the aft machine gun, taking Miss Aida over inside his own manhole. We haven't said much about Pete, for he was really timid, and lay low wherever he was placed, without a word. But when he came over where Brenda was and that sturdy Belgian watched his timid attempts to fire the machine gun, she was disgusted. "Pete, you no good! Have you forgot how the Baron hated a coward? Let me in there!" She shoved Pete aside, took charge of the gun herself and presently Byers was gratified to hear its active rattle as Brenda rather clumsily yet effectually opened upon the Germans. Pete assisted, handing fresh sheaves of ammunition and otherwise making himself useful. "Where you been, Pete?" she asked. "Why you leave us all?" "I wanted to learn to fly. Americaines, they give me a chance." The other plane, now spiraling upward, came within range of the Fokkers, and altogether the united firing from the two big biplanes was too much for the Boches, so they gradually retired with a loss of one plane, whose pilot Erwin had disposed of, as we have seen. Half an hour later they quietly dropped down at the aerodrome. The first gray hues of morning were just diffusing a lighter pallor and the stars were already dimming when on the deserted levels in front of the hangars the biplanes finally came to rest. Then out from a sentry box came the captain's orderly, who seemed much astonished. "Well, sir, I didn't look for you all back so soon. I rather feared that you might have to remain away another day."