It was an eerie-looking item--a sort of stove-pipe mounted on a disc, surrounded by a flock of flying buttresses. Frowning the General peered at it, then looked at the blow-ups on the walls. From the correct angle, the similarity was ominously unmistakable. He said, "What in hell is it, Captain?" MacReedy grinned. "Looks weird, doesn't it? It had me stumped for the better part of a week. There's only one thing it could be and that's what it is. Look...." He picked up a sort of miniature torpedo from the work-table, dropped it down the stove-pipe. The thing worked like a trench-mortar. Some spring in the base of the tube sent the rocket flying in a high arc to smack the opposite wall and drop to the floor. "It's a mobile rocket-launcher," he said needlessly. "I'd lay odds it can be used for atomic warheads." "Good Lord!" cried the General. His mind was in a racing turmoil. The problem with the Nazi V-1 and V-2 weapons during World War Two had been the immobility of their launching platforms. If _They_ had managed to get around it.... He thought of an insuperable obstacle, said, "But what about back-blast? Don't tell me they've found a metal able to stand up under the heat of launching." "I doubt it," replied MacReedy seriously. "They use this barrel to give her a boost like a trench-mortar shell. My hunch is the rocket doesn't fire until she's well off the ground." "Is it accurate?" the General asked, thunderstruck. "Is a trench-mortar accurate?" the model-maker countered. "Ask anybody who's been in Korea." It was a wallop for the General. Atomic rocket-launchers, mobile rocket-launchers that could function as artillery, could outrange the A-gun perhaps by hundreds of miles. And if the missiles thus fired could be guided--he could see no reason why not--the A-gun was already obsolete. He sat down on a packing box and mopped his brow although the cellar was far from hot. He said and his voice was unsteady, "Thanks, MacReedy, I think maybe you have done it." "I think so," said the model-maker. He wasn't boasting, but he was sure of himself. "You want to take it along with you? It should be quite simple to make. I've got a few improvements over _Their_ supports, I think." "If it's the last thing I do," said the General, rising, "I'm going to see you get credit for what you've done." MacReedy made a gesture of dismissal. "Don't let it bother you, General," he said. "I like my work. Maybe you could arrange for me to make some models for the War College." "Hell, why not the Smithsonian?" said the General. "Why not both? We ought to have a historical ordnance exhibit somewhere. And you're the man, no doubt about it." As he left with the precious model MacReedy asked, "By the way, General, what do you want me to work on next?" The General hesitated, then said, "Follow your hunches--logic if you will. Let's see what the next weapon after this one is going to be. You've been ahead of us the rest of the way."