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"Like you said. About how it applies to war in space." Buy some time here. What *does* Vauban have to do with war in space?
"I'm waiting," said Dimak. "Give me the insights that occupied you for two hours just yesterday."
"Well of course fortifications are impossible in space," said Bean. "In the traditional sense, that is. But there are things you can do. Like his mini-fortresses, where you leave a sallying force outside the main fortification. You can station squads of ships to intercept raiders. And there are barriers you can put up. Mines. Fields of flotsam to cause collisions with fast-moving ships, holing them. That sort of thing."
Dimak nodded, but said nothing.
Bean was beginning to warm to the discussion. "The real problem is that unlike Vauban, we have only one strong point worth defending -- Earth. And the enemy is not limited to a primary direction of approach. He could come from anywhere. From anywhere all at once. So we run into the classic problem of defense, cubed. The farther out you deploy your defenses, the more of them you have to have, and if your resources are limited, you soon have more fortifications than you can man. What good are bases on moons Jupiter or Saturn or Neptune, when the enemy doesn't even have to come in on the plane of the ecliptic? He can bypass all our fortifications. The way Nimitz and MacArthur used two-dimensional island-hopping against the defense in depth of the Japanese in World War II. Only our enemy can work in three dimensions. Therefore we cannot possibly maintain defense in depth. Our only defense is early detection and a single massed force."
Dimak nodded slowly. His face showed no expression. "Go on."
Go on? That wasn't enough to explain two hours of reading? "Well, so I thought that even that was a recipe for disaster, because the enemy is free to divide his forces. So even if we intercept and defeat ninety-nine of a hundred attacking squadrons, he only has to get one squadron through to cause terrible devastation on Earth. We saw how much territory a single ship could scour when they first showed up and started burning over China. Get ten ships to Earth for a single day -- and if they spread us out enough, they'd have a lot more than a day! -- and they could wipe out most of our main population centers. All our eggs are in that one basket."
"And all this you got from Vauban," said Dimak.
Finally. That was apparently enough to satisfy him. "From thinking about Vauban, and how much harder our defensive problem is."
"So," said Dimak, "what's your solution?"
Solution? What did Dimak think Bean was? I'm thinking about how to get control of the situation here in Battle School, not how to save the world! "I don't think there is a solution," said Bean, buying time again. But then, having said it, he began to believe it. "There's no point in trying to defend Earth at all. In fact, unless they have some defensive device we don't know about, like some