
his post. From his seat in remote physical comfort and relative physical safety, he monitored the signals of
one spy device after another, ranging now a decade farther into the past, then five miles north; next two
years uptime, then a dozen miles southwest. Still no alien predator's passage showed in the lush symbolic
grass that grew on Derron's screen. The enemy he sought had no lifeline of its own, and would be visible
only by the death and disruption that it broadcast.
"Nothing yet," said Derron curtly, without turning, when he felt his supervisor's presence at his elbow.
The supervisor, a captain, remained looking on for a moment and then without comment walked quietly
on down the narrow aisle. Still without lifting his eyes from his screen, Derron frowned. It irritated him to
realize that he had forgotten the captain's name. Well, this was only the captain's second day on the job,
and the captain, or Derron, or both of them, might be transferred to some other duty tomorrow. The
Time Operations Section of Sirgol's Planetary Defense Forces was organizationally fluid, to put it mildly.
Only a few months ago had the defenders realized that the siege might be extended into time warfare.
This sentry room, and the rest of Time Operations, had been really functional for only about a month, and
it had yet to handle a real fight. Luckily, the techniques of time warfare were almost certainly entirely new
to the enemy also; nowhere else but around the planet Sirgol was time travel known to be possible.
Before Derron Odegard had managed to recall his captain's name, the first battle fought by Time
Operations had begun. For Derron it began very simply and undramatically, with the calm feminine voice
of one of the communicators flowing into his earphones to announce that the berserker space fleet had
launched toward the planet several devices that did not behave like ordinary missiles. As these weapons
fell toward the planet's surface they vanished from direct observation; the sentry screens soon discovered
them in probability-space, falling into the planet's past.
There were five or six objects-the number was soon confirmed as six-dropping eight thousand years
down, ten thousand, twelve. The sentries watching over the affected sectors were alerted one after
another. But the enemy seemed to understand that his passage was being closely followed. Only when
the six devices had passed the twenty-one-thousand-year level, when their depth in the abyss of time had
made observation from the present practically impossible, did they stop. Somewhere.
"Attention, all sentries," said a familiar, drawling male voice in Derron's headset. "This is the Time
Operations commander, to let you all know as much as I do about what's going on. Looks like they're
setting up a staging area for themselves down there, about minus twenty-one thousand. They can shoot
stuff uptime at us from there, and we probably won't be able to spot it until it breaks into real-time on us,
and maybe not until it starts killing."
The psych-music came back. A few minutes passed before the calm voice of a communications girl
spoke to Derron individually, relaying orders for him to shift his pattern of search, telling him in which
dimensions and by how much to change his sector. The sentries would be shifting all along the line, which
meant that an enemy penetration into real-time was suspected. Observers would be concentrating near
the area of the invasion while still maintaining a certain amount of coverage everywhere else. The first
enemy attack might be only a diversion.
These days, when an enemy missile dug near the shelters, Derron rarely bothered to take cover, never
felt anything worse than the remotest and vaguest sort of fear; it was the same for him now, knowing that
battle was joined, or about to be. His eye and hand remained as steady as if he knew this was only one
more routine training exercise. There were advantages in not caring very much whether death came now
or later.
Still, he could not escape the hateful weight of responsibility, and the minutes of the watch dragged more
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