"That's why I ought to do th' runnin'," growled Johnny. "I can make three feet to his two."

"It's all settled," said Hopalong, decisively. "I got th' kerosene, an' I'm keepin' it. Come on. No more talkin'."

They followed him over the course he had picked out and with a caution which steadily increased as they advanced until at length they went ahead only when the crescent moon was obscured by drifting clouds. Ahead loomed the two-story gambling-hall, its windowless rear wall of bleached lumber leaden in the faint light. An occasional finger of fire stabbed from its south wall to be answered by fainter stabs from the open, the reports flat and echoless. A distant voice sang a fragment of song and a softened laugh replied to a ribald jest. A horse neighed and out of the north came quaveringly the faint howl of a moon-worshiping coyote.

The three friends, face down on the sand, now each behind a squat bush, wriggled forward silently but swiftly, and gained new and nearer cover. Again a cloud passed before the moon and again they wriggled forward, their eyes fixed on the top of the roof ahead, two of them heading for the same bush and the other for a shallow gully. The pair met and settled themselves to their satisfaction, heads close together as they consulted about the proper setting of the rear sights. One of them knelt, the rifle at his shoulder reaching out over the top of the bush, his companion sitting cross-legged at his side, a pile of dull brass cartridges in the sombrero on the ground between his knees to keep the grease on the bullets free from sand.

The kneeling man bent his head and let his cheek press against the stock of the heavy weapon, whispered a single word and waited. Twice there came the squeak of a frightened rat from his companion and instantly from the right came an answering squeak as the figure of a man leaped up from the gully and sprinted for the lead-colored wall, the heavy, jarring crash of a Winchester roaring from the bush, to be repeated at close intervals which were as regular as the swing of a pendulum. A round, dark object popped up over the flat roof line and the cross-legged man on the ground threw a gun to his shoulder and fired, almost in one motion. The head dropped from sight as the marksman slid another cartridge into the magazine and waited, ready to shoot again or to exchange weapons with his kneeling friend.

The runner leaped on at top speed, but he automatically counted the reports behind him and a smile flashed over his face when the count told him that the second rifle was being used. He would have known it in no other way, for the spacing of the shots had not varied. Again the count told of the second change and a moment later another extra report confirmed his belief that the roof was being closely watched by his friends. A muffled shout came from the building and a spurt of fire flashed from the loophole, but toward the sky and he fancied he heard the sound of a falling body. Far to his left jets of flame winked along a straggling line, the reports at times bunched until they sounded like a short tattoo, while behind him the regular crashing of an unceasing Winchester grew steadily more distant and flatter.

His breath was coming in gulps now for he had set himself a pace out of keeping with the habits of years and the treacherous sand made running a punishment. During the last hundred feet it was indeed well for him that Johnny shot fast and true, that the five-hundred grain bullets which now sang over his aching head were going straight to the mark. He suddenly, vaguely realized that he heard wrangling voices and then he threw himself down onto the sand and rolled and clawed under the building, safe for the time.

Gradually the jumble of footsteps over his head impressed themselves upon him and he mechanically drew a Colt as he raised his head from the earth. Suddenly the roaring steps all went one way, which instantly aroused his suspicions, and he crawled hurriedly to the black darkness of a pile of sand near the bottom of the south wall, which he reached as the steps ceased. No longer silhouetted against the faint light of the open ground around the building, a light which was bright by contrast with the darkness under the floor, he placed the canteen on the ground and felt for chips and odds and ends of wood with one hand while the other held a ready gun.

There came the sharp, plaintive squeaking of seldom-used hinges, which continued for nearly a minute and then a few unclassified noises. They were followed by the head of a brave man, plainly silhouetted against the open sand. It turned slowly this way and that and then became still.

"See anythin'?" came a hoarse whisper through the open trap.