the front takes every ship that's fit to go aloft. We have only wrecks back here. You're sure about that spark-plug affair?"

"Yes, sir," said the 'copter pilot. "My ship crashed, sir. I started the motors again, trying to take off. Eggs began to drop about me instantly."

"Nasty!" said the major-general. "I was going to join my men. We've flung a line of artillery ahead of the thing. Motor-driven, of course. But if they can pick up motors by the spark-waves, the bomber knows all about it. Nasty!"

He lit a cigar, calmly. The gyrocar shifted suddenly and backed away from the thing it had been tangled in.

"Why ain't the bombers been shot down?" demanded Sergeant Walpole angrily. "Dammit, sir, if it wasn't for them bombers—"

"Up to an hour ago," said the major-general, "we had lost sixty-eight planes trying to get those bombers. You see, it works both ways. The bombers drop eggs to help the Wabbly defend itself. And the Wabbly uses that power-beam you spoke of to wipe the sky clean about the bombers. I wondered how it was done, before you explained, sir. Do you men want to come with me? Get on the running-board if you like. We shall probably be killed."

The gyrocar purred softly away, with two horses left wandering and two men clinging fast in a sweep of wind. They found a ribbon of concrete road and the wind sang as the car picked up speed. Then, suddenly, it bucked madly and went out of control, and, as suddenly, was passing along the road again. The Wabbly had passed over the roadway here.

And then they heard gunfire ahead. Honest, malevolent gunfire. Flashes lit the horizon. The gyrocar speeded up until it fairly hummed, and the wind rushed into the nostrils and mouths of the men on the running-boards. The cannonade increased. It reached really respectable proportions, until it became a titanic din. As the road rose up a long incline, a shell burst in mid-air in plain view, and the driver of the gyrocar jammed on the brakes and looked down upon the strangest of sights below.

There were other hills yet ahead, and from behind them came that faint, indefinite glow which is the glow of the lights of a city. At the bottom of a valley, a mile and a half distant, there was the Wabbly. Star-shells flared near it, casting it into intolerable brightness and clear relief. And other shells were breaking upon it and all about it. From beyond the rim of hills came the flashes of guns. 

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