The Tank Lords by David Drake

Thus, when Man did reach the stars, the ships were crewed in large measure by Universalists. Those who had prayed for, worked for, and even sworn by the Way of the Stars, Via Stellarum, were certain to be among the first treading it. On Earth, the Church of the Lord’s Universe had been a vocal minority; in the colonies spreading like a bacterial culture through the galaxy, Universalists were frequently in the majority.

There were changes. Inevitably, fragmentation followed success as centuries and the high cost of interstellar communication made each congregation a separate entity. But the basic thrust of the Church, present peace and safety for Mankind, remained even when reality diluted it to lip service or less. Mercenaries were recruited mostly from rural cultures which were used to privation—and steeped in religion as well. Occasionally a trooper might feel uneasy as he swore, “Via!” for the Way had been a way of peace.

But mercs swore by blood and the martyrs as well; and few had better knowledge of either blood or innocent victims than the gunmen of the mercenary companies.

Powerguns

By the 21st century, missile-firing small arms appeared to have reached the pinnacle of their development, and there was nothing on hand to replace them. The mass and velocity of projectiles could be juggled but they could not be increased in sum without a corresponding increase in recoil or backblast. Explosive bullets were very destructive on impact, but they had no penetration beyond the immediate blast radius. An explosive bullet might vaporize a leaf it hit near the muzzle as easily as the intended target down-range, and using explosives in heavy brush was worse than useless because it endangered the shooter.

Lasers, though they had air-defense applications, were not the infantryman’s answer either. The problem with lasers was the power source. Guns store energy in the powder charge. A machinegun with one cartridge is just as effective—once—as it is with a thousand-round belt, so the ammunition load can be tailored to circumstances. Man-killing lasers required a four-hundred-kilo fusion unit to drive them. Hooking a laser on line with any less bulky energy source was of zero military effectiveness rather than lesser effectiveness.

Science lent Death a hand in this impasse—as Science has always done, since the day the first wedge became the first knife. Thirty thousand residents of St. Pierre, Martinique, had been killed on May 8, 1902. The agent of their destruction was a “burning cloud” released during an eruption of Mt. Pelee. Popular myth had attributed the deaths to normal volcanic phenomena, hot gases or ash like that which buried Pompeii; but even the most cursory examination of the evidence indicated that direct energy release had done the lethal damage. In 2073, Dr. Marie Weygand, heading a team under contract to Olin-Amerika, managed to duplicate the phenomenon.

The key had come from spectroscopic examination of pre-1902 lavas from Pelee’s crater. The older rocks had shown inexplicable gaps among the metallic elements expected there. A year and a half of empirical research followed, guided more by Dr. Weygand’s intuition than by the battery of scientific instrumentation her employers had rushed out at the first signs of success. The principle ultimately discovered was of little utility as a general power source—but then, Olin-Amerika had not been looking for a way to heat homes.

Weygand determined that metallic atoms of a fixed magnetic orientation could be converted directly into energy by the proper combination of heat, pressure, and intersecting magnetic fields. Old lava locks its rich metallic burden in a pattern dictated by the magnetic ambiance at the time the flow cools. At Pelee in 1902, the heavy Gauss loads of the new eruption made a chance alignment with the restressed lava of the crater’s rim. Matter flashed into energy in a line dictated by the intersection, ripping other atoms free of the basalt matrix and converting them in turn. Below in St. Pierre, humans burned.

When the principle had been discovered, it remained only to refine its destructiveness. Experiments were held with different fuel elements and matrix materials. A copper-cobalt charge in a wafer of microporous polyurethane became the standard, since it appeared to give maximum energy release with the least tendency to scatter. Because the discharge was linear, there was no need of a tube to channel the force as a rifle’s barrel does; but some immediate protection from air-induced scatter was necessary for a hand-held weapon. The best barrel material was iridium. Tungsten and osmium were even more refractory, but those elements absorbed a large component of the discharge instead of reflecting it as the iridium did.