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Rh counted out of the game until the last whistle sounded and the referee's falling hand closed the fun.

So he was after his man with grim determination not to let him get away. Having gone to so much trouble, and received in addition several scratches in the contest, he meant to keep everlastingly at it.

The Boche dodged to one side, as there were men running toward them, and already several lights had sprung up. Tom was close at his heels, and gaining rapidly, being spurred on by an ambition to complete the good work he and Harry had started.

He saw the spy glance back over his shoulder. The situation must have appeared very grave to the other, who could expect to meet with short shrift if caught in the act of trying to destroy the hangars and planes of the American aviators in this bold fashion.

Just then Tom saw the man raise his arm. Guessing what he intended to do, the Yankee air pilot dodged just in time. Some object went hissing past, close to his head. An instant later there was a loud explosion in his rear that seemed to make the very air quiver.

Of course the Boche had hurled a grenade with the intention of making further pursuit on the part of his persistent adversary impossible.