David Weber: Hell's Gate

"We'd have to recall Fifty Ulthar's platoon from the coast, if you want to use him, Sir," the chief sword added, driving home the implied reprimand with exquisite tact.

Jasak was tempted to point out that Magister Halathyn had already dragged him back from the company's main CP at the coastal enclave, so there was really no reason he shouldn't recall Fifty Ulthar. Except, of course, that he couldn't. First, because doing so would require him to acknowledge to the man who'd been his father's first squad lance that he'd made a mistake. Both of them might know he had, but he was damned if he was going to admit it.

But second, and far more important, was the patronage system which permeated the Arcanan Army, because patronage was the only thing that kept Garlath in uniform. Not even that had been enough to get him promoted, but it was more than enough to ensure that his sponsors would ask pointed questions if Jasak went that far out of his way to invite another fifty to replace him on what promised to be quite possibly the most important portal exploration on record. If Magister Halathyn's estimates were remotely near correct, this was the sort of operation that got an officer noticed.

Which, in Jasak's opinion, was an even stronger argument in favor of handing it to a competent junior officer who didn't have any patrons … and whose probable promotion would actually have a beneficial effect on the Army. But?

"All right, Chief Sword," he sighed. "My respects to Fifty Garlath, and I want his platoon ready to move out at first light tomorrow."

The weather was much cooler on the other side of the base portal. Although it was only one hour earlier in the local day, it had been mid-afternoon?despite Jasak's best efforts?before Commander of Fifty Garlath's First Platoon had been ready to leave base camp and step through the immaterial interface between Hilmaran swamp and subarctic Andara in a single stride. The portal's outbound side was located smack on top of the Great Andaran Lakes, five thousand miles north of their departure portal, in what should have been the Kingdom of Lokan. In fact, it was on the narrow neck of land which separated Hammerfell Lake and White Mist Lake from Queen Kalthra's Lake. It might be only one hour east of the base camp, but the difference in latitude meant that single step had moved them from sweltering early summer heat into the crispness of autumn.

Jasak had been raised on his family's estates on New Arcana, less than eighty miles from the very spot at which they emerged, but New Arcana had been settled for the better part of two centuries. The bones of the Earth were the same, and the cool, leaf-painted air of a northern fall was a familiar and welcome relief from the base camp's smothering humidity, but the towering giants of the primordial forest verged on the overpowering even for him.

For Fifty Garlath, who had been raised on the endless grasslands of Yanko, the restricted sightlines and dense forest canopy were far worse than that. Hundred Olderhan, CO of Charlie Company, First Battalion, First Regiment, Second Andaran Temporal Scouts, couldn't very well take one of his platoon commanders to task in front of his subordinates for being an old woman, but Sir Jasak Olderhan felt an almost overpowering urge to kick Garlath in the ass.

He mastered the temptation sternly, but it wasn't easy, even for someone as disciplined as he was. Garlath was supposed to be a temporal scout, after all. That meant he was supposed to take the abrupt changes in climate trans-temporal travel imposed in stride. It also meant he was supposed to be confident in the face of the unknown, well versed in movement under all sorts of conditions and in all sorts of terrain. He was not supposed to be so obviously intimidated by endless square miles of trees.

Jasak turned away from his troopers to distract himself (and his mounting frustration) while Garlath tried to get his command squared away. He stood with his back to the brisk, northern autumn and gazed back through the portal at the humid swamp they had left behind. It was the sort of sight with which anyone who spent as much time wandering about between universes as the Second Andarans did became intimately familiar, but no one ever learned to take it for granted.

Magister Halathyn's tone had been dismissive when he described the portal as "only a class three." But while the classification was accurate, and there were undeniably much larger portals, even a "mere" class three was the better part of four miles across. A four-mile disk sliced out of the universe … and pasted onto another one.

It was far more than merely uncanny, and unless someone had seen it for himself, it was almost impossible to describe properly.

Jasak himself had only the most rudimentary understanding of current portal theory, but he found the portals themselves endlessly fascinating. A portal appeared to have only two dimensions?height, and width. No one had yet succeeded in measuring one's depth. As far as anyone could tell, it had no depth; its threshold was simply a line, visible to the eye but impossible to measure, where one universe stopped … and another one began.

Even more fascinating, it was as if each of the universes it connected were inside the other one. Standing on the eastern side of a portal in Universe A and looking west, one saw a section of Universe B stretching away from one. One might or might not be looking west in that universe, since portals' orientation in one universe had no discernible effect on their orientation in the other universe to which they connected. If one stepped through the portal into Universe B and looked back in the direction from which one had come, one saw exactly what one would have expected to see?the spot from which one had left Universe A. But, if one returned to Universe A and walked around the portal to its western aspect and looked east, one saw Universe B stretching away in a direction exactly 180? reversed from what he'd seen from the portal's eastern side in Universe A. And if one then stepped through into Universe B, one found the portal once again at one's back … but this time looking west, not east, into Universe A.

The theoreticians referred to the effect as "counterintuitive." Most temporal scouts, like Jasak, referred to it as the "can't get there" effect, since it was impossible to move from one side to the other of a portal in the same universe without circling all the way around it. And, since that held true for any portal in any universe, no one could simply step through a portal one direction, then step back through it to emerge on its far side in the same universe. In order to reach the far side of the portal at the other end of the link, one had to walk all the way around it, as well.

Frankly, every time someone tried to explain the theory of how it all worked to Jasak, his brain hurt, but the engineers responsible for designing portal infrastructure took advantage of that effect on a routine basis. It always took some getting used to when one first saw it, of course. For example, it wasn't at all uncommon to see two lines of slider cars charging into a portal on exactly opposite headings?one from the east and the other from the west?at the exact same moment on what appeared to be exactly the same track. No matter how carefully it had all been explained before a man saw it for the first time with his own eyes, he knew those two sliders had to be colliding in the universe on the other side of that portal. But, of course, they weren't. Viewed from the side in that other universe, both sliders were exploding out of the same space simultaneously… but headed in exactly opposite directions.

From a military perspective, the … idiosyncrasies of trans-temporal travel could be more than a little maddening, although the Union of Arcana hadn't fought a true war in over two centuries.