"When he got there, the Kangas decided they had to forget their usual strategy. They hadn't come up with an FTL com system, though they had FTL travel-of a sort-but the best speed they could manage was about five times light-speed, and the closest system with a heavy Kanga population was over a hundred light-years away. Not only that, but their scout's crew was so scared by what they were picking up-remember, by their standards they'd just found a whole race of horribly powerful demons-that they never came closer to Sol than twenty light-years, so what they were seeing was already twenty years old. It took the scout almost twenty-five years to get home with the news, and it would take them another thirty-plus years to send out their sampling ships just to collect specimens, much less take them home, produce a bug for us, and send it back out. Even if they modified their strategy by sending an entire research ship to develop the bug on-site, we'd have had almost eighty years to develop between the time those signals originated and the time they could get back to Solarian space again.
"They were scared, but they were still logical. Rather than risk warning us with a sampling mission or by hanging around in orbit with a research vessel, they decided to forget nice, neat biological solutions this once and rely on brute force. It would only take them another ten years or so to muster a fleet of warships, and taking the time to make sure they were loaded for draken seemed logical to them.
"But-" she grinned, a sudden, tigerish expression that struck him with a chill "-they made a mistake. They polated our rate of progress based on their own, and humans are much better gadgeteers than they are. Not only that, we've always been a bloodthirsty bunch. They'd fought their last real war with pikes and black powder, and they didn't have the least idea how military competition pressurizes R&D.
"By the time they got back to Sol, there were colonies on Luna and Mars and large-scale mining operations in the asteroids. Political relations were still pretty shaky, too, and all the promises not to militarize space had collapsed once there was a thriving presence in space to protect-or prey upon. Nobody had a real 'space navy,' but there were quite a few armed ships. Most of the colonies had some sort of rudimentary defensive systems, and Terra had some pretty advanced orbital defenses. Most of them were aimed at planetary threats, but the existence of armed spacecraft meant they'd been designed to shoot the other way, too."
She sipped more coffee, and he remembered what she'd said about being a 'histortech.' He could believe it; she had the air of someone expounding on a special interest area.
"They had FTL, but they were still using reaction drives. Basically, they used what you'd call the Bussard ram principle to accelerate in normal-space before they translated." She paused at his puzzled expression, then shrugged. "I can explain that later-right now, just remember that they managed interstellar travel by first accelerating and then ducking into another dimension where the velocity attained in this one is effectively accelerated to a multiple of light-speed, then dropping back into normal-space and decelerating. That's one reason the trip would take them so long; they needed to accelerate in normal-space before they could kick in their FTL systems. Okay?"
"If you say so," he said dubiously.
"We manage things a lot better now," she assured him, "but all this was four or five hundred years ago, remember." She paused again, a brief stab of pain and loss showing in her eyes. "Anyway," she said softly, "four hundred years from when I got into this mess.
"At any rate, they put together a fleet and sent it off. Of course, a fleet of Bussard rams produces a hell of a lot of light when it decelerates, and they had to start decelerating well short of Sol. Terran astronomers spotted them while they were still over a year out and realized someone was coming-a lot of someones, in fact. We're a pretty nasty and suspicious lot ourselves, and it was possible our visitors weren't friendly, so prudence suggested sending somebody out to see.
"But if they were friendly, none of the Terran blocs wanted their rivals getting in first and making some kind of private deal with them. There was a lot of time pressure, but they got themselves organized in a hurry and sent out an 'international' welcoming party made up of ships from all the major power blocs." She flashed that tigerish grin again. It really made her look much less like a teenager, he thought uneasily.
"The Kangas freaked. There they were, ready to smash a bunch of people they expected to find fooling around with atmospheric aircraft, and instead they were being intercepted by ships using a nuclear-powered torch drive! It never occurred to them that we might even consider the possibility of peaceful contact-their minds don't work that way. They were still six months out when our ships came into weapon range and they opened fire.
"They wiped us, of course, but we hadn't sent totally unarmed ships, and we got a couple of them, as well. That really upset them, because they were still decelerating, which committed them to entering our system-either that, or they had to duck back into alpha-space, bypass us, stop, get back up to speed on a home-bound vector, and come back in another seventy or eighty years. And who knew what we'd be capable of by then?
"So they decided to carry out their original plan, and it was our side's turn to freak. I've never seen a Bussard ship myself. They've been obsolete for centuries now, but they were big bastards, and they had a lot of them. Terra assumed the worst, and it's amazing how friendly enemies can get in those stances. By the time the Kangas were down to maneuvering speed and passing Neptune, the major power blocs had decided to bury their differences.
"The Kanga force was two or three times as strong as they'd expected to need-I said they were logical-but their estimate had been too low. Their ships were big, but their mass-to-drive ratio was poor, and the sides were a lot more even than they'd planned or we thought. They never did get any planet-busters into range of Terra, but they wiped every human in the asteroid belt and did the same for Mars. We lost every regular warship and most of the merchant conversions we had, but only a few of their light attack craft got close enough to hit Terra, and they didn't have anything much bigger than a couple of megatons."
Aston felt his remaining fringe of hair trying to stand on end at how casually she used the term "megatons."
"We stopped them, but they killed four and a half billion people, most of them civilians. Of course, from the Kanga viewpoint, there's no such thing as 'civilians' or 'noncombatants,' but we were pretty ired."
Her words were light again, but her eyes were not.
"We learned a lot from the Kangas' wreckage. Not as much as we would have liked, but more than they probably expected we could. Unfortunately, the Kangas are logical, and they'd left one ship out where we couldn't get at it. As soon as it saw how things were going, it headed home at max.
"The result back home when it got there was pandemonium-and it must have been even worse because they didn't have any samples of our technology. But they did have a head start, and they'd been working hard at R&D ever since they sent their first fleet out, just in case. They knew none of their FTL transports had been captured intact, so they figured we hadn't gotten any samples of their multi-dee-that's what makes FTL travel possible-but they were only half right. Their long-range missiles used a cruder form of the same principle, and we did get our hands on a couple of them.
"Anyway, they went to crash building rates to put together another fleet, and they had eighteen major planetary populations and an undamaged deep-space industrial capacity. They were scared, but they got over their panic when they started puting the odds. Besides, God was on their side.