That was a complicated operation, carried out by Marsmen who'd had experience in space. Commander Farr had planned to lead it himself and would have if his physician had let him go; but Ruth Hendrix wasn't about to let him expose himself to six gravities.

You must start with five pounds of fuel to send one pound from Earth orbit to Mars, or vice versa. The same five pounds of fuel is needed regardless of whether the pound sent between planets is payload or ship structure, so ship designers work like mad to keep the ships light and build in no more structural strength than they need. The ships never accelerate at more than a tenth of a gravity - so why build them to stand up to more than that? That means the ships can never land. They go from orbit to orbit, but they never touch down on either Earth or Mars.

People go up to and come down from the ships by landing boat, but fuel and cargo are sent up with laser launchers. At Marsport there's a big field of lasers, all aiming into mirrors. Those mirrors are focused onto one big mirror at the end of the field. Cargo capsules ride a track onto a platform over that mirror, the lasers are turned on, and the cargo pods are shoved upward at six gravities. The space expeditionary force rode up in cargo capsules.

It was an inside job, of course. Farr and the Marsport members of the revolutionary committee had been planning it for years, placing agents in the right jobs in the spaceport, finding out which officials could be bribed, and all the rest of it. When the time came the patriots with space experience got into the capsules, rode up as cargo, and took over the ship.

It sounds simple. I'm sure it wasn't. I've heard a dozen versions of the battle for the Feddie ship, and the tamest one is enough to curl my hair. But they took her, and we now had an operational spaceship -fueled for the trip to Earth.

"That's why we've got to get working bombs," Erica said. I'd been pestering her to take some time off from work while I still had leave.

"You're going to drop atomic bombs on Earth?" I was horrified. "It's the stupidest thing I ever heard oft They'll sterilize Mars."

"We're not going to drop the bombs," Erica said. "We're going to threaten to drop the bombs. But only if they bomb us. We know we can't do any real damage to Earth - but we can knock out a big city. And we don't have to tell them which city it will be."

"Aha." I thought about that. "So every city's got a reason to argue against Feddie interference with us. Devilish. Only how do you know all this? You're not on the Committee."

"No, but I wouldn't work on the damned bombs until they told me what they were going to do with them. Would you?"

"I wouldn't work on the damn things at all. The whole idea gives me the willies. I want no part of atom bombs."

So, of course, I got sent out to explode one.

There are no airplanes on Mars. Can't be: not enough air. The usual means of transportation is by tractor or monorail. But Mars is big: half the diameter of Earth, meaning a quarter of Earth's surface area; since Earth is three-quarters covered with water, there's as much land on Mars as there is on Earth.

Most settled areas on Mars are in the southern hemisphere because southern hemisphere summers are a whack of a lot longer than northern hemisphere summers. It's not that way on Earth, but Earth has a circular orbit. Mars is closer to the sun during summer in the south. The growing season is longer, and the mine strikes were made here.

Most settlements are in the south, but not all. The most interesting scientific features are in the north: Nix Olympica, the big canyons, most active volcanoes. The first settlements in the north were scientific laboratories in the Tharsis Region, where the volcanoes are. Even in the north it's easier to live on Mars than to get here; certainly it was in the early days, so the scientists came to stay. They brought their wives and their students; after a while technicians and farmers and support people came out and stayed as well.

This was before the Federation. The first Mars settlements were founded by the United States in a cooperative effort among NASA and a lot of private foundations and universities. They didn't exactly thrive, but they were more or less selfsupporting. Then the first wave of true colonists came, and the big mineral strikes were made halfway around Mars, near Hellas Rim and Edom and Iapygia where Marsport is located. The new colonies were linked together with monorails, but it was too far around to the earlier places, Livermore and New Chicago and Cal Tech's Pasadena East. Still, there had to be some means of getting from the old scientific colonies to the new commercial ones five thousand miles away. There wasn't a lot of traffic back and forth, but there was some.

If you don't have airplanes and there's no monorail, there is only one way to get across that much distance on Mars: a ballistic rocket. This isn't an airplane, although it looks a little like one. It is a reusable rocket ship with wings. It takes off on rocket power and is hurled like a bullet or a shell, traveling in free fall until it comes back into the thin Martian atmosphere and the wings can bite.

It still doesn't fly. It glides at hypersonic speed, until it has slowed down to where the pilot can turn it on its tail and let it fall toward the surface. Then he lights the rocket again and settles down gently - if everything is working. The first probes from Earth to Mars landed almost that way; the technique is hardly new.

It's a lousy system for short-range travel, but the only way to go long distances.

When Katrinkadorp rose and threw out the Feddies, there was a passenger rocket at Botha Field. After a complex series of negotiations, Commander Farr persuaded them to fly the ship down to the Rim. The reason was simple enough: Farr and the Free Mars Committee thought it wouldn't take much to bring the old university colonies into the independence movement. They wanted to send political agents to New Chicago to negotiate with the Regents who governed the scientific colonies. We had many allies, both student and faculty, and the Feddie garrison was small. It shouldn't take much to throw out the Feddies - but first the Regents had to be convinced that independence was possible and that the new government wouldn't cut off their connections with their colleagues back on Earth.

None of this concerned me. I'd heard that we had a ship and that some of the Rim stations were working to manufacture fuel for it - liquid oxygen was no problem, we made that every day, but rocket fuel is something else again - but I wasn't involved.

The hell I wasn't.

I'd been hanging around Erica's workshop. I was irritated because they wouldn't let me in there. Nobody but project personnel allowed. I'd got the goddamn uranium for them. They wouldn't have any project to work on if my troops and I hadn't given ourselves a permanent case of flat feet marching across the goddamn planet.

To top it off, Erica had been working when she wasn't asleep, and in the little time we did have together she acted mysterious, hinting that something big was coming but she wouldn't tell me what. She was worried and moody. Not much fun to be around. So we fought like cats and dogs in the little time we had together.

If I sound a little bitter, like a neglected hero, you've got it. If that sounds a little childish, you're right again. So what? It was the way I felt.

So there I stood, looking for an excuse to be near the lab in case she came out, when Perry found me. "Hey, Garrett, the Old Man wants to see you." Then he went into the lab. He got to go in. He was messenger and aide to Commander Farr. Ten-year-old kid brother gets in, but not old Garrett.

I wandered up to the study, wondering what Farr wanted this time, and knowing it meant a new assignment. I'd had three weeks since I got back with the uranium. To hell with the war, and independence, and - Oh, I didn't mean it, of course. In the first place, if we didn't win, my future on Mars was a little less appetizing than the future I'd had on Earth. And I could hardly complain about Army Mickey Mouse, because we didn't have any. In theory I was an officer - full lieutenant, instead of just acting - and exempt from what little bullshit there was. Not that the rank meant much. I was Lieutenant Pittson, and Sarge was just "Sarge," whatever that meant, but he sure as hell outranked me, which was as it should have been. And if anybody had tried to get some old Rimrat like Zeke Terman to salute me, it might have been interesting for a couple of minutes…