[Illustration: A tempest of lead rattled about the engine.
Almost before they realised it, they had swung around the curve.]

"Consarn their yellow hides," grunted Pete, "that shows they kep' closer tabs on us then we knew. I reckon they was scared to follow us to Rosario, thinking, like we did, that the regulars was there. Waal, that was a neat little surprise party, but it didn't work."

Round the curve they tore, at a hair-raising gait, but the engine stuck to the metals. Ten minutes later a cheer went up, as the red-brick station, which they knew must mark the Esmeralda switch, came in sight.

"I got the switch key from Whiting," cried Buck, as they reached the switch, "I'll throw it."

He swung himself down from the cab, and ran rapidly ahead, down the track, to the switch lever. As he bent over it, from a clump of bushes near by, there leaped a score or more of men.

"Buck! Buck!" yelled Coyote Pete.

The big fellow looked up just in time. The foremost of his attackers was upon him as he threw the switch over. Buck picked him up, and fairly pitched the little Mexican over his head. The man fell in a heap at one side of the track.

"Come ahead!" bawled Buck, while the others hesitated and held back.