"What's that?"

"I said get Dad. Now!"

There was a long delay. "The dust is interfering with the beam," Erica said.

"Just be damn glad we can get through at all."

"I am. Have I told you I love you?"

"Not often enough.

"Erica, what is happening? Why have you two left the road? What are you doing in the Basin?"

"Dad, listen!" She managed to cut him off. If we'd been using radio and had to wait for him to say "over" and switch from transmit to receive, we might be there yet.

She told him what had happened at Windhome. "And two tractors full of Federation Marines, with that officer, Bielenson, left Windhome toward Ice Hill an hour ago," she finished.

"So you think they are coming for me?"

"I don't know," I said. "But they blew up Windhome and arrested Sarge."

"It is possible. It even makes sense," Sam said. "With Sarge and myself arrested and our stations ruined as an example to others, the boycott might well collapse. Yes, I think that is what they have in mind. But it is very late in the day. There is barely enough sunlight for them to reach us in time. Perhaps they will wait until morning -"

"Dad, you've got to get away!" Erica said.

"Get away? Run? No, Ricky. If they come to destroy my home, they must take it from me."

I didn't know it then, but that very second marked the beginning of the Martian War of Independence.

We cut off so that Sam could organize his family to fight. As with Windhome there was no way we could help. We couldn't get there; we had barely enough sunlight to get to the road.

"At least you're safe," I said. "Now what can we do? Try to follow the tractor they put Sarge in? They'll have a long start."

"Yes." She wasn't really listening to me. She was looking out at the Rim to the west.

"I suppose we'd better find a good place out of the wind. We'll be out here for the night -"

"Garrett! That's Zeke Terman's station up there!"

"Yeah. And he can see the road. At least we can find out what the cops are doing." I slewed Aunt Ellen around and aimed the telescope. It was much easier this time; we were a lot closer to Zeke's place than we were to Ice Hill.

Erica lifted the mike and went through the calling routine: "Zeke Terman, Zeke Terman, Zeke Terman, Mayday, Mayday, Mayday. Answer by photophone only. We are on Hill 252, Sector Greeneight. Mayday." She repeated it three times. We had to give our location, because the transmitting laser must be aimed at the receiver.

Finally we got an answer. "Mayday, this is Terman. What the hell are you doing out there? Who are you?"

"You'll recognize my voice," Erica said. "Are you alone? Are you all right?"

"Why the hell shouldn't I be all right? Of course I'm alone, think I've got crew to take off work and chat on the goddamn phone?"

"Zeke, this is an emergency. Please answer a silly question. It's important that we can be sure you're alone and all right. What does Henrietta call her cat?"

There was a moment of silence. Then Zeke said, "Ricky Hendrix? That you? Henrietta calls the silly animal 'Titwillow' because of something you said. What's going on?"

We told him.

"Son of a bitch! Okay, I'll relay the word down the west Rim. Where did they take Sarge?"

"They put him in a tractor and headed west on the Hellastown road about an hour ago," Erica said.

"Wait one," Zeke told us. He left the mike open, and we heard him shouting. "Bonnie, get the boys up here! Get everybody. Come running!" Then there was silence for a while, and he came back on the line. "Okay, I've got the tractor spotted, I think. Bright yellow?"

"Right!"

"Not makin' very good time with all this dust. They're still a good half hour from Iron Gap. I'll get the boys and be to the Gap before the cops get there. A couple of sticks of 40 percent and they'll not be getting to Hellastown tonight."

"By God!" I said. "We can get Sarge loose!" I took the mike from Erica. "Thanks, Zeke."

"That you, Garrett? Thanks, hell. That's my son-in-law's sponsor those bastards have in that tractor. You want in this fight, you'd better hurry to the Gap!"

Mars is at the inner edge of the asteroid belt, and has very little atmosphere. When a big chunk of rock hits, as frequently happens - frequent meaning every hundred thousand years or so - the impact raises ringwall craters that stay until another rock breaks them down, or the wind slowly grinds them into dust. There's no rain to erode the mountains.

The crater that became the Wall was formed by a meteriod a billion years ago. Countless other rocks smashed into the old ringwall, until only one stretch was left, and that was cracked down the center. This cracked wall lies directly across the road from the eastern Rim stations to Hellastown. The crack is called Iron Gap, and it's no more than twenty feet wide in some places. You don't have to go through the Gap to get to Hellastown, but the quickest way around takes five hours of travel through the boulder fields, or even longer if you try to climb the Wall with a tractor.

I looked at it on the map but didn't start the tractor.

"What are you waiting for?" Erica demanded.

"Your father will kill me if I take you into a battle."

"You let me worry about my father. Do you think I'm fragile? That I can't take care of myself? I may not be as strong as you are, but you're not going to leave me out of this!"

"All right, all right. I'm sorry. But I've got about a million years of instincts that say I shouldn't do this." I started the tractor, and headed toward the Gap.

"Instincts be damned. Mars is more my home than yours! Oh, I'm sorry, Gary. I don't really mean that. We both live here."

"You don't have to be sorry. I was never very interested in the independence movement. I'm not now. But Sarge is my friend, and the Feddies won't let us get out here and live, they've got to mess everything up. And ruin the only home I've ever been happy in -"

I couldn't finish. Thinking about Windhome as I'd last seen it brought tears, and I needed to see as well as I could to get through the boulders and dust.

After we reached it, I decided to chance the road. Daylight would be gone in less than an hour, and we'd never reach the Gap across country. I'd never had Aunt Ellen going this fast before.

"Reckless Garrett, The Terror of the Martian Roadways," I said. "Whoopee!"

"You like this, don't you?" She was very serious.

"Like it? My home's in ruins, my buddy's been taken by the cops, we may both be killed, and -"

"And you love it. It's all right, Gary. But you do. You want to fight. I think all men do. I wonder if women ever feel that way? I never did. Is it something instinctual, or do you learn it, or -"

"Good Lord, girl!"

"I'm sorry. I'm scared, that's all. No, don't slow down, I'm going with you. And I love you."

" I didn't start this fight."

"No. Some men learn to control that love of combat. But you're not sorry it has started. You'll cry for Windhome, and for friends who are killed, and you'll be glad when it's over, but you're not sorry it started."

"You're a nut. "Sure."

We rounded a curve, and suddenly the Gap was in sight, about ten kilometers ahead. I drove on. Then, 250 meters above the Gap floor, there was a startling spurt of dust from one of the straightwalled sides. Something big dislodged and fell into the Gap, sealing it.

"They'll not get through there before sunset," I said. "They must not have reached the Gap yet! Zeke wouldn't do that if they were already through!"

"I wonder how far ahead they are?"

"Don't know, but I'm not going to stop to talk," I said. The sun was almost to the Rim ahead of us. Soon we'd be in shadow, and after that we'd be on battery power.

Erica began fiddling with the radio. She didn't turn on the transmitter, but swept through all the bands, listening - "Four Love Victor, this is One Dog Niner. Four Love Victor, this is One Dog Niner. Mayday. Mayday. Over."