Tanks were born in the muck and wire of World War One. Less than sixty years later, there were many who believed that technology had made the behemoths as obsolete as horse cavalry. Individual infantrymen of 1970 carried missiles whose warheads burned through the armor of any tank. Slightly larger missiles ranged kilometers to blast with pinpoint accuracy vehicles costing a thousand times as much. Similar weaponry was mounted on helicopters which skimmed battlefields in the nape of the earth, protected by terrain irregularities. At the last instant the birds could pop up to rip tanks with their missiles. The future of armored vehicles looked bleak and brief.
Technology had dragged the tank to the brink of abandonment. Not surprisingly, it was technology again which brought the panzers back. The primary breakthrough was the development of portable fusion power plants. Just as the gasoline engine with its high horsepower-to-weight ratio had been necessary before the first tanks could take the field, so the fusion unit's almost limitless output was required to move the mass which made the new supertanks viable. Fusion units were bulky and moderately heavy themselves, but loads could be increased on a fusion-powered chassis with almost no degradation of performance. Armor became thick—and thicker. With the whole galaxy available as a source of ores, iridium replaced the less effective steels and ceramics without regard for weight.
Armor alone is not adequate protection. Stationary fortresses can always be battered down—as the French learned in 1940, having forgotten the lesson Caesar taught their ancestors at Alesia two millennia before. Caterpillar treads had given the first tanks cross-country ability; but at the cost of slow speed, frequent breakage, and great vulnerability to attack. Now that power was no longer a factor, even the armored bulk of a tank could be mounted on an air cushion.
The air-cushion principle is a very simple one. Fans fill the plenum chamber, a solid-skirted box under a vehicle, with air under pressure. To escape, the air must lift the edges of the skirts off the ground—and with the skirts, the whole vehicle rises. Fans tilt with the velocity and angle of attack of the blades determining the amount and direction of thrust. The vehicle skims over surfaces it does not touch.
On tanks and combat cars, the lift was provided by batteries of fans mounted on the roof of the plenum chamber. Each fan had its own armored nacelle. Mines could still do considerable damage; but while a single broken track block would deadline a tracked vehicle, a wrecked fan only made a blower a little more sluggish.
Successful protection for the supertanks went beyond armor and speed. Wire-guided missiles are still faster, and their shaped-charge warheads can burn holes in any practical thickness of any conceivable material—if they are allowed to hit. Reconnaissance satellites, computer fire control, and powerguns combined to claw missiles out of the air before they were dangerous. The satellites spotted missile launchers usually before they fired and never later than the moment of ignition. Fire control computers, using data from the satellites, locked defensive weaponry on the missiles in microseconds. And a single light-swift tribarrel could hose any missile with enough fire in its seconds of flight to disintegrate it.
Hand-launched, unguided rockets—buzzbombs—were another problem, and in some ways a more dangerous one despite their short range and small bursting charges. Individual infantrymen fired them from such short ranges that not even a computer had time enough to lay a gun on the little rockets. But even here there was an answer—beyond the impossible one of killing every enemy before he came within two hundred meters.
Many armored vehicles were already fitted with a band of antipersonnel directional mines just above the skirts. Radar detonated the mines when an object came within a set distance. Their blast of shrapnel was designed to stop infantry at close quarters. With only slight modification, the system could be adapted against buzzbombs. It was not perfect, since the pellets were far less destructive than powergun bolts, and the mines could not be used in close terrain which would itself set them off. Still, buzzbombs were apt to be ill-aimed in the chaos of battle, and a tank's armor could shrug off all but a direct hit by the small warheads.
So tanks roamed again as lords of battle, gray-gleaming phoenixes on air cushions. Their guns could defeat the thickest armor, their armor could blunt all but the most powerful attacks. They were fast enough to range continents in days, big enough to carry a battery of sensors and weaponry which made them impossible to escape when they hunted. The only real drawback to the supertanks was their price.
A tank's fire control, its precisely metered lift fans, the huge iridium casting that formed its turret—all were constructs of the highest sophistication. In all the human galaxy there were probably no more than a dozen worlds capable of manufacturing war tools as perfect as the panzers of Hammer's tank companies.
But Hammer paid for the best, man and tank alike; and out of them he forged the cutting edge of a weapon no enemy seemed able to stop.