The Man from Bar-20
became sheer cliffs without a single way up their walls that a horse could master. A mile above Humpback Butte the walls curved inward until only a scant six hundred yards lay between them; and on the southern side of the eastern cliff, which jutted out into the valley, hidden behind an out-thrust point, was a narrow canyon leading into the valley which formed the northwestern outlet of the QE ranch. For nearly five miles north of Humpback Butte extended the valley, now a great, wide canyon; and not one of the several blind canyons in its great walls gave a way out. Anyone passing the hidden canyon would hunt in vain for an exit and have to return again.
Reaching his horse, Ackerman mounted and rode north at top speed, guiding the animal over grass as he threaded his way in and out among the obstructions. Speed was the pressing need now, for if he could gain the hidden canyon before his enemy found it on his return, he had him trapped. There was an up-thrust mass of rock, covered with brush and scrub timber, which lay before the entrance of the canyon; once up on that he could command both the canyon and the valley, the greatest range not over five hundred yards.
Dismounting in a thicket close to the entrance, he slipped to the canyon and looked for tracks. Finding none he clambered up on the mass of rock and
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