Hawk of the Hills by Robert E. Howard

GORDON WASTED NO TIME. He knew he could not escape from the ledge without a rope, by climbing either up or down, and he did not believe his enemies could reach the ledge from the ravine. He squirmed back through the cleft and ran down the slant of the cavern, expecting any instant to see his besiegers pouring into the moonlit mouth. But it stood empty, and the rifles outside kept up their irregular monotone. Obviously, Baber Ali did not realize that his victims had attempted an escape by the rear. The muffled shots he must surely have heard had imparted no meaning to him, or perhaps he considered they but constituted some trickery of El Borak's. Knowledge that an opponent is full of dangerous ruses is often a handicap, instilling an undue amount of caution.

Anyway, Baber Ali had neither rushed the cavern nor sent any appreciable number of men to reinforce the lurkers on the other side of the mountain, for the volume of his firing was undiminished. That meant he did not know of the presence of his men behind the cave. Gordon was inclined to believe that what he had taken for a strategically placed force had been merely a few restless individuals skulking along the ravine, scouting on their own initiative. He had actually seen only three men, had merely assumed the presence of others. The attack, too, had been ill-timed and poorly executed. It had neither trapped them all on the ledge nor in the ravine. The shot that killed Muhammad had doubtless been aimed at himself.