The movement saved his life, for his feet had hardly struck the ground when he heard the thud of a rifle bullet, the sharp crash of the weapon, and saw the leaden missile rip the leather on the cantle of the saddle. As though the shot were a signal, there followed others--a ripping, crashing volley. Sanderson saw the smoke spurts ballooning upward from behind some rocks and boulders that dotted the hills on both sides of the defile, he saw several of his men drop from their horses and fall prone to the ground. He shouted to the men to leave their horses and "take cover," and he himself sought the only cover near him--a wide fissure in the wall of the long slope below the point where the attackers were concealed. Streak, apparently aware of the danger, followed Sanderson into the shelter of the fissure. It was an admirable spot for an ambuscade. Sanderson saw that there were few places in which his men could conceal themselves, for the hostile force occupied both sides of the defile. Their rifles were still popping, and Sanderson saw two of the Double A force go down before they could find shelter. Sanderson divined what had happened--Dale and his men had overpowered Owen, and had set this ambuscade for himself and the Double A men. Dale was determined to murder all of them; it was to be a fight to a finish--that grim killing of an entire outfit, which, in the idiomatic phraseology of the cowpuncher, is called a "clean-up." Sanderson was aware of the disadvantage which must be faced, but there was no indication of fear or excitement in his manner. It was not the first time he had been in danger, and he drew his belt tighter and examined his pistols as he crouched against the ragged wall of the fissure. Then, calling Streak to him, he pulled his rifle out of the saddle holster and examined the magazine. Rifle in hand, he first surveyed the wall of the defile opposite him. The crevice in which he was hiding was irregular at the entrance, and a jutting shoulder of it concealed him from view from the wall of the defile opposite him. Another projection, opposite the jutting shoulder, protected him from any shots that might be aimed at him from his left. The fissure ran, with sharp irregularities, clear up the face of the wall behind him. He grinned with satisfaction when he saw that there were a number of places along the upward line of the fissure which would afford him concealment in an offensive battle with Dale's men. He contemplated making things rather warm for the Dale contingent presently; but first he must make sure that none of his own men was exposed to danger. Cautiously, then, he laid his head close to the ragged wall of the fissure and peered upward and outward. Behind a big boulder on the opposite side of the defile he saw a man's head appear.