It was a hard question to decide. Personal fear did not enter into the matter at all. The question was whether he owed his first duty to his family and Ruth or to the cause which he and every other right-thinking American had subscribed to when the United States got into this World War.

That was the point! Tom Cameron sighed, shrugged his shoulders, and again opened the door which gave egress to the forward deck of the German airship.

He pulled the door shut and breasted the cutting wind that rocked the airship as though she were in a heavy sea. He scrambled somehow along the deck to the pilot-house. There was a square of the same clouded glass in the door of this room. Through it he saw the shadow of a man with a row of instruments before him as well as several levers under his hand.

Tom had very little idea regarding the exact use of either the levers or the instruments. But he knew that he could put the Zeppelin out of commission with a few smashing blows if once he could get this man out of the way.

This whole forward part of the ship seemed deserted save for the man inside the room. Of course, the helmsman, or whatever he was called, must be in communication with all other parts of the great aircraft. If Tom would put his determination into practice he must overcome this man—and that quickly.

He opened the door. The man was aware of his presence, for the roar of the wind and the throbbing of the motors immediately reached the German’s ears more acutely. Tom saw him turn his head to look over his shoulder.

The young American had gripped his pistol by the barrel. He raised it and with all his force brought the weapon’s butt down on the padded helmet the man wore. Again and again he struck, while the fellow wheeled about and tried to grapple with him.

Tom broke the German’s goggles and the face before him was at once bathed in blood. Again and again he struck. The man sunk to his knees—then supinely to the deck, lying across the threshold of the room.

The American strode over him and looked swiftly about the hut. In a corner was fastened an iron bar. He seized it, and with repeated blows smashed the clock-faces and more delicate instruments, as well as beating the levers into a twisted wreck.

The Zeppelin lurched sideways, rolled, and then righted itself. But it lost headway and Tom felt sure that it would drift now at the mercy of the furious gale. He had accomplished his purpose.