Free Beyond the Burning Lands by John Christopher

crawled through a wilderness of black and gray in which was no living thing. Merely looking at it was enough to cast the spirit down.
    The peddler reined his horse between Greene’s and mine. He pointed west of north.
    â€œThose peaks are dead and have been for years. The pass lies between them.”
    â€œHow far?” Greene asked.
    â€œTwo miles, say, to the place where the pass begins.”
    â€œAnd the pass itself—another three?”
    â€œAbout that.”
    â€œWith a mile in which the ground is hot.”
    The peddler shook his head. “It is hot all the way. Or warm at least. But for a mile it smokes and you cannot put your hand to it.”
    Greene patted the water skin on his saddle bow.
    â€œWe must hope these things work. It will do us little good to get through with crippled horses. But delay serves no purpose.” He rose, turning in the saddle. “You have been sniveling for warmth all winter. Forward now, and get your bellies full!”
    We kept well clear of the smoking rivers. The shoes of our horses struck sparks from hard black rock. They had been heavily shod before we left the city but would not want much traveling on a surface like this to have fresh need of a farrier. In places there were pools of water and these too steamed. One of them, away to our right, spouted high with a noise like a thousand kettles screaming together. Although up to now there had been talking and joking among the men, they rode here in silence.
    The pass, rising between two black cones, looked an easy one, though as naked and dark and arid as everything else. We stopped and fitted the leather boots over the legs of the horses. This had been practiced and they endured it patiently. The boots had been cunningly made by the dwarfs, with grease inside to ease their friction, but they must hamper the animals. Small pipes led from the water-skins to the top of each boot, from where containing rings of perforated metal would allow the water to trickle down. All this had been carefully designed, but of course no one had used it yet to ride over smoldering earth.
    We led the horses first, this being our best way of judging the heat. The surface was at times hard rock, at others loose and powdery. Reaching down one could feel the warmth. The dust was like sand but large-granuled and black.
    Gradually we began to feel it with our feet as well; no more than a glow under the sole at first but the glow increased and became discomfort. I put my fingers to the heel of my boot and quickly drew them back. Greene said:
    â€œI think this is where we make our dash. Mount and release the tap on the waterskin. Stay in single file and keep a distance to avoid fouling the man in front. Do not fall too far behind him, either! Delay adds delay, and Sergeant Bristow brings up the rear. He will not be pleased if he is kept waiting.”
    Greene led, followed by his groom and the peddler. Edmund and I came next; then the men and last the Sergeant. Greene signaled an order to trot, then canter, finally gallop. Some of the horses whinnied—from nervousness, I hoped, rather than discomfort. My own, a bay called Garance, was quiet except for the snorting of her breath and the dull thudding of her hooves.
    The ground was loose and became looser. It smoked only in patches but the patches were more and more frequent. Drops of water, flung from the horses’ legs, steamed as they touched the black sand. Above on either side loomed the harsh black peaks from which this stone vomit had poured—and might again, since volcanoes could wake suddenly after long years of sleeping.
    I felt Garance stumble and recover. If a horse were to fall there would be a turmoil which might be disastrous for all behind, since the track here was too narrow for one to pass another. She had lost ground and I spurred her to make it up. Not that she required much spurring; I guessed she was feeling the heat by now.
    It was a long mile. The pass