"She got blown to pieces."

"Fortunes of war. Biology takes second place to survival. But some of them are coming around to my way of thinking. You can't live in this place without the evidence staring you in the face."

"What evidence is there in Eros?"

"Ender, look around you. Human beings didn't carve this place. We like taller ceilings, for one thing. This was the b.u.g.g.e.rs' advance post in the First Invasion. They carved this place out before we even knew they were here. We're living in a b.u.g.g.e.r hive. But we already paid our rent. It cost the marines a thousand lives to clear them out of these honeycombs, room by room. The b.u.g.g.e.rs fought for every meter of it."

Now Ender understood why the rooms had always felt wrong to him. "I knew this wasn't a human place."

"This was the treasure trove. If they had known we would win that first war, they probably' would never have built this place. We learned gravity manipulation because they enhanced the gravity here. We learned efficient use of stellar energy because they blacked out this planet. In fact, that's how we discovered them. In a period of three days, Eros gradually disappeared from telescopes. We sent a tug to find out why. It found out. The tug transmitted its videos, including the b.u.g.g.e.rs boarding and slaughtering the crew. It kept right on transmitting through the entire b.u.g.g.e.r examination of the boat. Not until they finally dismantled the entire tug did the transmissions stop. It was their blindness -- they never had to transmit anything by machine, and so with the crew dead, it didn't occur to them that anybody could be watching."

"Why did they kill the crew?"

"Why not? To them, losing a few crew members would be like clipping your nails. Nothing to get upset about. They probably thought they were routinely shutting down our communications by turning off the workers running the tug. Not murdering living, sentient beings with an independent genetic future. Murder's no big deal to them. Only queen-killing, really, is murder, because only queen-killing closes off a genetic path."

"So they didn't know what they were doing."

"Don't start apologizing for them, Ender. Just because they didn't know they were killing human beings doesn't mean they weren't killing human beings. We do have a right to defend ourselves as best we can, and the only way we found that works is killing the b.u.g.g.e.rs before they kill us. Think of it this way. In all the b.u.g.g.e.r wars so far, they've killed thousands and thousands of living, thinking beings. And in all those wars, we've killed only one."

"If you hadn't killed the queen, Mazer, would we have lost the war?"

"I'd say the odds would have been three to two against us. I still think I could have trashed their fleet pretty badly before they burned us out. They have great response time and a lot of firepower, but we have a few advantages, too. Every single one of our ships contains an intelligent human being who's thinking on his own. Every one of us is capable of coming up with a brilliant solution to a problem. They can only come up with one brilliant solution at a time. The b.u.g.g.e.rs think fast, but they aren't smart all over. But on our side, even when some incredibly timid and stupid commanders lost the major battles of the Second Invasion, some of their subordinates were able to do real damage to the b.u.g.g.e.r fleet."

"What about when our invasion reaches them? Will we just get the queen again?"

"The b.u.g.g.e.rs didn't learn interstellar travel by being dumb. That was a strategy that could work only once. I suspect that we'll never get near a queen unless we actually make it to their home planet. After all, the queen doesn't have to be with them to direct a battle. The queen only has to be present to have little baby b.u.g.g.e.rs. The Second invasion was a colony -- the queen was coming to populate the Earth. But this time -- no, that won't work. We'll have to beat them fleet by fleet. And because they have the resources of dozens of star systems to draw on, my guess is they'll outnumber us by a lot, in every battle."

Ender remembered his battle against two armies at once. And I thought they were cheating. When the real war begins, it'll be like that every time. And there won't be any gate I can go for.

"We've only got two things going for us, Ender. We don't have to aim particularly well. Our weapons have great spread."

"Then we aren't using the nuclear missiles from the First and Second Invasions?"

"Dr. Device is much more powerful. Nuclear weapons, after all, were weak enough to be used on Earth at one time. The Little Doctor could never be used on a planet. Still, I wish I'd had one during the Second Invasion."

"How does it work?"

"I don't know, not well enough to build one. At the focal point of two beams, it sets up a field in which molecules can't hold together anymore. Electrons can't be shared. How much physics do you know, at that level?"

"We spend most of our time on astrophysics, but I know enough to get the idea."

"The field spreads out in a sphere, but it gets weaker the farther it spreads. Except that where it actually runs into a lot of molecules, it gets stronger and starts over. The bigger the ship, the stronger the new field."

"So each time the field hits a ship, it sends out a new sphere--"

"And if their ships are too close together, it can set up a chain that wipes them all out. Then the field dies down, the molecules come back together, and where you had a ship, you now have a lump of dirt with a lot of iron molecules in it. No radioactivity, no mess. Just dirt. We may be able to trap them close together on the first battle, but they learn fast. They'll keep their distance from each other."

"So Dr. Device isn't a missile -- I can't shoot around corners.

"That's right. Missiles wouldn't do any good now. We learned a lot from them in the First Invasion, but they also learned from us -- how to set up the Ecstatic Shield, for instance."

"The Little Doctor penetrates the shield?"

"As if it weren't there. You can't see through the shield to aim and focus the beams, but since the generator of the Ecstatic Shield is always in the exact center, it isn't hard to figure it out."

"Why haven't I ever been trained with this?"

"You always have. We just let the computer tend to it for you. Your job is to get into a superior strategic position and choose a target. The shipboard computers are much better at aiming the Doctor than you are."

"Why is it called Dr. Device?"

"When it was developed, it was called a Molecular Detachment Device. M.D. Device."

Ender still didn't understand.

"M.D. The initials stand for Medical Doctor, too. M.D. Device, therefore Dr. Device. It was a joke." Ender didn't see what was funny about it.

They had changed the simulator. He could still control the perspective and the degree of detail, but there were no ship's controls anymore. Instead, it was a new panel of levers, and a small headset with earphones and a small microphone.

The technician who was waiting there quickly explained how to wear the headset.

"But how do I control the ships?" asked Ender.

Mazer explained. He wasn't going to control ships anymore. "You've reached the next phase of your training. You have experience in every level of strategy, but now it's time for you to concentrate on commanding an entire fleet. As you worked with toon leaders in Battle School, so now you will work with squadron leaders. You have been a.s.signed three dozen such leaders to train. You must teach them intelligent tactics; you must learn their strengths and limitations; you must make them into a whole."

"When will they come here?"

"They're already in place in their own simulators. You will speak to them through the headset. The new levers on your control panel enable you to see from the perspective of any of your squadron leaders. This more closely duplicates the conditions you might encounter in a real battle, where you will only know what your ships can see."

"How can I work with squadron leaders I never see?"

"And why would you need to see them?"

"To know who they are, how they think--"

"You'll learn who they are and how they think from the way they work with the simulator. But even so, I think you won't be concerned. They're listening to you right now. Put on the headset so you can hear them."

Ender put on the headset.

"Salaam," said a whisper in his ears.

"Alai," said Ender.

"And me, the dwarf."

"Bean."

And Petra, and d.i.n.k; Crazy Tom, Shen, Hot Soup, Fly Molo, all the best students Ender had fought with or fought against, everyone that Ender had trusted in Battle School. "I didn't know you were here," he said, "I didn't know you were coming."