Again was the fleeing spy compelled to whirl aside because of threatening peril ahead. Dodging in and out between the khaki-colored canvas field hangars he sought desperately to throw Tom off his track; but no hound ever followed its quarry with more pertinacity than the Yankee air pilot followed now.
Then something happened. Tom came in collision with a runner, so that the two of them fell headlong to the ground. By instinct Tom hugged the other in his arms. He suspected on the spur of the moment that this might be the other spy, trying to elude Harry, and cutting across his track by the merest chance.
The fellow struggled furiously, but Tom managed to get a good hold on him, and kept it tenaciously. As the other was also clutching him his further pursuit of the fleeing spy seemed doomed to failure; and so Tom felt that the only thing left was to make sure of this party.
"Hey, Tom, let go! You're choking me!" came a voice that electrified him, and caused him to release his clutch.
After all it was Harry upon whom he had fallen, Harry who having lost all track of his man was rushing wildly this way and that in hope of once again getting in touch with the fellow.
"Quick, before it's too late, join me!" shrilled Tom, scrambling to his feet again as best he could, and feeling angry because of this ridiculous accident. "There he goes, Harry! After him again!"
So they both started once more to run at top speed. The agile spy had been able to put considerable distance between them while his pursuers struggled on the ground, and seemed likely to escape. But there was one thing that stood in his way.
Men were running this way and that in every direction, calling to one another, and trying to understand what all the row was about. A squad of oncoming hostlers blocked his passage. They evidently were beginning to get light on the situation, for discovering the panting runner they now set up a concerted shout.
This compelled the hunted Boche to turn again on his heel, and so he lost a portion of his previous gain. Tom took fresh heart on seeing this. Given one or two such lifts as this, and he believed he would again come to hand grips with the fellow. And with Harry close at his heels he fancied the next encounter would surely terminate badly for the Hun spy.
"Spread out some, Harry!" he managed to shout.