Uller Uprising by H. Beam Piper — Read

General Carlos von Schlichten threw his cigarette away, flexed his hands in his gloves, and set his monocle more firmly in his eye, stepping forward as the footsteps on the stairway behind him ceased and the other officers emerged from the squat flint keep -- Captain Cazabielle, the post CO; big, chocolate-brown Brigadier-General Themistocles M'zangwe; little Colonel Hideyoshi O'Leary. Far in front of him, to the left, the horizon was lost in the cloudbank over Takkad Sea; directly in front, and to the right, the brown and gray and black flint mountains sawed into the sky until they vanished in the distance. Unseen below, the old caravan-trail climbed one side of the pass and slid down the other, a sheer five hundred feet below the parapet and the two corner catapult-platforms which now mounted 90-mm guns. On the little hundred-foot-square parade ground in front of the keep, his aircar was parked, and the soldiers were assembled.

Ten or twelve of them were Terrans -- a couple of lieutenants, sergeants, gunners, technicians, the sergeant-driver and corporal-gunner of his own car. The other fifty-odd were Ulleran natives. They stood erect on stumpy legs and broad, six-toed feet. They had four arms apiece, one pair from true shoulders and the other connected to a pseudo-pelvis midway down the torso. Their skins were slate-gray and rubbery, speckled with pinhead-sized bits of quartz that had been formed from perspiration, for their body-tissues were silicone instead of carbon-hydrogen. Their narrow heads were unpleasantly saurian; they had small, double-lidded red eyes, and slit-like nostrils, and wide mouths filled with opalescent teeth.