"The rest was just a repetition of the atom blasts of the first Martian War and the earlier wars on Terra. The only difference was the size of the bomb. The cyclotrons set off the chain reaction in the plutonium ... the plutonium set off the reaction in the U-235 ... common enough on a world made practically all of pitchblende and other Uranium compounds. The same thing could happen to ... say Terra ... if we ever started a chain reaction in one of the commoner elements such as iron, or carbon. Or even one of the commoner gases. Anyway there are only three satellites in the Uranian System now ... and eight less Cat cruisers and one less superdreadnaught. I suspect the Cats can hardly afford to lose them, too. Wouldn't surprise me to hear that Mars has been feeling around for an armistice even by the time we get home. The very fact that they have no idea how their fleet was destroyed will tickle them in the right place, I suppose." Scott spoke in surprised tones. "So they blew themselves up with their own fancy cannon." Hartnett nodded reflectively. "Um ... that's about it. Of course we had to set up the proper conditions." He grinned at the younger man. "Or, you might say, the 'Booby Trap'...."