Then the sounds must have been made by the striker or the hounds. Blakely had no dogs of his own. Indeed they were common property at the post, most of them handed down with the rest of the public goods and chattels by their predecessors of the ----th. At all events, he felt far too languid, inert, weak, indifferent or something. If the striker, he had doubtless come down for cool water. If the hounds, they were in search of something to eat, and in either case why bother about it? The incident had so far distracted his thoughts from the worries of the night that now, at last and in good earnest, he was dropping to sleep. But in less than twenty minutes he was broad awake again, with sudden start--gasping, suffocating, listening in amaze to a volley of snapping and cracking, half-smothered, from the adjoining room. He sprang from his bed with a cry of alarm and flung himself through a thick, hot veil of eddying, yet invisible, smoke, straight for the communicating doorway, and was brought up standing by banging his head against the resounding pine, tight shut instead of open as he had left it, and refusing to yield to furious battering. It was locked, bolted, or barred from the other side. Blindly he turned and rushed for the side porch and the open air, stumbling against the striker as the latter came clattering headlong down from aloft. Then together they rushed to the parlor window, now cracking and splitting from the furious heat within. A volume of black fume came belching forth, driven and lashed by ruddy tongues of flame within, and their shouts for aid went up on the wings of the dawn, and the infantry sentry on the eastward post came running to see; caught one glimpse of the glare at that southward window; bang went his rifle with a ring that came echoing back from the opposite cliffs, as all Camp Sandy sprang from its bed in answer to the stentorian shout "Fire! No. 5!" CHAPTER XIII WHOSE LETTERS? There is something about a night alarm of fire at a military post that borders on the thrilling. In the days whereof we write the buildings were not the substantial creations of brick and stone to be seen to-day, and those of the scattered "camps" and stations in that arid, sun-scorched land of Arizona were tinder boxes of the flimsiest and most inflammable kind.