"I dunno," answered the driver, "some says yes an' some says no, but if you want my honest opinion I'd say thet the Injuns ain't got nerve enough to start trouble no more. Why, they're so all-fired meek an' lowly thet——"

Zip! A bullet whizzed through the sultry air and whirled the stage driver's slouch hat from his head. Zip! Zip! Zip! and the air was alive with the whine and drone of bullets.

"Hold-ups, by the 'tarnal," yelled the driver, accompanying his words with a whirl of oaths. "Down behind the coach, Sam!" addressing the guard, who always rode beside him on the box with loaded rifle; "we'll stand 'em off, or I'm a greaser."

The guard leaped down behind the coach at the same moment that Bert and Dick and Tom made for the same shelter. There were only two passengers in the coach, and they, pale of face and with chattering teeth, joined the little group.

"Them shots came from that bunch of chaparral over there," said Buck, "but it's an almighty queer way for road agents to go about a job. They ginerally——"

"Injuns!" shouted the guard, who had been peering cautiously around the end of the coach. "Injuns, by the Lord Harry, shoot me if they ain't!"

A thrill passed over the three comrades, and they looked warily forth in the direction in which the guard had pointed. Sure enough, over the top of the chapparal they could discern a number of hideously painted faces surmounted by tufts of eagle feathers. The guard, recovering from his first paralysis of astonishment, took careful aim at one of them and pulled the trigger. A yell of pain followed the report of his rifle, and a savage shout went up from the band of redskins. They answered with a volley that bored through the sides of the coach, and narrowly missed several of the little group gathered behind it.

"We got to turn the coach over," exclaimed Buck, "the top an' floor's a whole lot thicker than the sides, and besides, as it is there's nothin' to prevent the bullets from comin' in underneath. Lend a hand, everybody, and we'll get 'er over."

He crept in between the mules and commenced unharnessing them. Bert and his friends leaped to his assistance, although during the process they were much more exposed to the fire of the Indians. The latter were not slow to perceive this, and they opened a steady fire. But fortunately they were poor shots, and most of their bullets went wild. Several struck the mules, however, and the unfortunate animals plunged and kicked so wildly that the three friends and the driver stood in almost as much danger from them as from the bullets. Finally the traces were unfastened, and the mules, released from the harness, raced wildly away.

Bert and the others dodged nimbly back behind the coach, and then all hands set to the task of overturning it. By dint of exerting all their strength they finally managed to lift one side of the clumsy vehicle until it toppled over with a crash.