Still, he could not sleep for any great length of time. The instinct of vigilance and the sense of responsibility would not leave him. In his half-dreaming, half-waking state, he once thought he heard a light foot-fall, and presently as he dozed with eyelids shut there came a soft touch upon his temple. Lifting his hand he seized that of his visitor,--Fanny Harvey. "Why are you not resting?" he asked, "and where is Ruth?" "Ruth is sleeping, as we hoped you might be. 'Tired Nature's sweet restorer' is all you need, Mr. Drummond, yet you do not seem to have had more than a cat nap. Twice I have stolen in here to see you, and then, though I was fearful of waking you, you slept peacefully through it all." "Well, I must have slept a couple of hours anyway, and I slept soundly until within the last few minutes. Have none of the men got back yet, Miss Harvey? Do you know what time it is? I suppose Wing is sleeping." "Mr. Wing ought to be sleeping, but he isn't. The sentry--Patterson I think they call him--summoned him up to the lookout there in the rocks, oh, about an hour ago, and when the sergeant came back he mounted his horse and rode away down the canon. He said there was something requiring his attention. But you are to drink this chocolate and lie still." Drummond slowly strove to rise. He was too anxious, too nervous, to remain where he was. "And none of them have returned yet?" he asked. "I cannot understand that. No, please do not strive to detain me here. I'm perfectly able to be up and about, and if Wing is gone it's my business to look after things." Over among the rocks across the narrow canon the first object to meet his gaze as he arose was Moreno, reclining there bound and helpless, while near at hand a soldier had thrown himself on his saddle blanket and was sound asleep. The plash of the waters in the brook, dancing and tumbling down the chasm, made sweet, drowsing music for his ears, a lulling, soothing sound that explained perhaps the deep slumber of his trooper friend. "I heard Mr. Wing tell that man to lie down and sleep," said Miss Harvey, as the young officer's eyes seemed to darken with menace at the sight of a sentry sleeping on guard. "Moreno is securely tied, and both Patterson up there and I here are now his keepers. The senora and her daughter are in the other cave, forbidden to go near him." Glancing up at the stunted cedar where Patterson stood faithful to his trust, Drummond saw that he was peering steadily southward through the black field-glasses. "What do you see, Patterson?" he hailed. "Where is Wing? Any of the men coming back?" "Wing has gone on down the valley, sir. Some of our fellows, two or three only, were coming back, but they didn't come fast enough to suit him. The ambulance will be here in a minute or two,--it's just below us down the canon now."