We were well equipped for this. Magnetically strapped to the back of each tank was a
thruster unit normally used for space flight. Each unit had a gimbal-mounted hydrogen-
oxygen rocket capable of accelerating the tank at forty Gs, which we humans could
survive because we were each floating in a liquid bath with the same average density as
our bodies.
The unit also contained a pair of Hassan-Smith receivers spatially connected through
four other dimensions to some major fuel tanks somewhere on the planet. Thus, we could
continue accelerating indefinitely, since we didn't have to carry our fuel along with us.
This was the trick that let us get to the stars in the first place.
It was a pity that the transporters didn't conveniently lend themselves for use as a
battlefield communication device.
A Mark XIX Main Battle Tank does not have a good hydrodynamic form. It's mostly
an armored fusion power supply with some computers and a human being inside.
It moved itself around using a MagLev track-laying system, laying magnetic bars in
front of itself, gliding over them, and picking them up as it left. When traveling over a
ferro-magnetic surface, it could keep the bars inside itself, magnetize the surface and then
move much faster over it. And when you put one on a real MagLev track, it could really
move out, hitting three thousand kilometers an hour, in a vacuum.
Weapons and other useful things are strapped on the outside, pretty much wherever
they'll fit. However, for this mission, there was a way around this unstreamlined shape.
Attached to the front of each tank was a long pole tipped with something that looked
a lot like an arrowhead from an ancient crossbow bolt. When pushed hard enough
through the water, and with air injected just behind the arrowhead, a cavity formed
behind it that was big enough for the tank to ride inside. Once we were moving fast
enough, the air was no longer needed, and we were moving in something close to a hard
vacuum. This permitted us to reach supersonic speeds, under water. At least it worked
fine on rocket-powered torpedoes, and we had even tested it, once, on an empty tank,
which was good enough for a Kashubian veteran.
When Agnieshka told me that everybody was ready, and the moment had come when
our orders said we should attack, I said, "Ladies and gentlemen! It's time to see to the
Earthworms' proper education! We must teach them that it is not nice to invade
somebody else's planet. I'll see you again when we're airborne! Let's move!"
But actually, it was Agnieshka who gave the firing signal. Timing on this one was
very important.
Dream World vanished and I was working at combat speed, which is as fast as the
human brain can operate without damage. For me, that was fifty-five times normal.
Soldiers in combat often feel a natural form of this, where it seems that the world slows
down around them. What we used was machine augmented, and vastly accelerated.
It is difficult, or perhaps impossible to describe fighting at combat speed in a tank.
You and your tank's computers become a single entity. All of its sensors become your
senses, and you can see everything from thirty cycles per second up to and including hard
X-rays. Only it isn't exactly seeing. You are touching and hearing and smelling as well,
all at the same time. You can taste the chemical makeup of everything around you, and
feel every vibration. The tank is your body, and you know exactly what every part of it is