At a word from his master the well trained Buckskin doubled up, and lay down on the ground. Most cowboy ponies are taught to do this trick by their masters, and it is in common use; so that the punchers believe it is a poor animal that has not learned to roll over and play dead on occasion.
Bob, too, managed to induce his mount to do the same thing; but to make it absolutely certain that no unwise flounder on the part of Domino might betray them, he sat upon the horse's head, soothing him by little pats on his glossy hide.
"I hear 'em coming," announced Frank, presently.
The sounds reached him against the wind, so that it was quite natural to believe the approaching horses must by now be very close. There was a confused pounding that could only spring from a large body of animals. The trained ear of Frank caught a significance in the clash of hoofs that told him much more than Bob was able to make out.

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