“I think we also have to assume that they’ve captured accurate maps of both the Karys and Kelsayr Chains,” chan Geraith pointed out. “If they have, they probably realize just how unimproved both chains are beyond Karys and Lashai, not to mention the water gap here in Traisum. Where Kelsayr’s concerned, they’ll probably assume — logically — that six thousand miles of ocean and another forty-six hundred miles overland must constitute a pretty severe bottleneck here in Traisum, and they’ll evaluate our mobility beyond the railheads on the basis of piss-poor roads and trails, wagons, and pack animals. By the same token, even if Therahk’s completely correct about Harshu’s not realizing how much we can transport by rail, I’ll guarantee you he does realize we can move one hell of a lot more in a freight car than we could in a six-horse wagon down a dirt trail. So if I were him, and if I could move my entire army four thousand miles in less than two weeks, I wouldn’t be especially worried by the possibility of being flanked on a seventeen thousand-mile march by an enemy restricted to horse-drawn transport. Even if he knows about the shipyard at Renaiyrton and the rail line through Kelsayr and Lashai, he’ll figure he has plenty of defensive depth on that front.”
and later...
“My mother always used to tell me a little knowledge is a dangerous thing,” he said. “And she used to say it’s not what you don’t know is so that hurts you; it’s what you think you know that isn’t so. At the moment, Harshu knows a lot more about us than we know about him, but no Arcanan’s ever so much as heard of a Bison. I realize seventeen thousand miles is a long way, but we’ve got over thirty-five hundred miles of rail line clear across Kelsayr and Lashai and TTE’s already laying track in Resym. For that matter, its advanced work crews are cutting and grading roadbed over a hundred miles down-chain from the current railhead. Since we haven’t lost Voice contact with them yet but we have lost contact with the portal forts in Nairsom and on Lake Wernisk in Resym, I’m inclined to think that’s as far up-chain as they’ve gotten. What it means from our current perspective is that it’s only about seven thousand miles cross-country from the railhead to Hell’s Gate as opposed to four thousand miles going via Karys. For that matter, it’s barely three thousand miles to Thermyn, and at least until Harshu is heavily reinforced, the Cut works both ways as a defensive feature. For that matter,” the division-captain’s already thin smile became a razor, “he may just find it costing him more than he expects to get his dragons through the portal here even after he’s reinforced.”
and finally...
We send along a full recon section, complete with a Mapper, a half-dozen Plotters to keep an eye on the sky for dragons, and a good Distance Viewer or two to make it harder than hell for the Arcanans to see them coming even if they’re mounting standing patrols of dragons around the portals.
Three things jump out at me.
1. The Sharonanas have far more ground mobility than the Arcanians give them credit for, both from the rail ways and from steam powered vehicles extending from the railways.
2. There are indeed railway building units behind Arcanian lines in the secondary chain from Hells Gate that include voices. Railway units that have been by-passed and are in Voice communication with the Tenarthian Army relief column. And likely these railway building detachments have steam trains, heavy equipment, rail cars and loose rails to armor them. >tum tee tum tee dum<
3. Arcanians have utterly no idea how badly they can be out scouted by Sharonan talents on the ground. Nor do they realize how well the Sharonans can camouflage themselves from aerial surveillance AKA from distance viewers. This has implications both in the Cut as well as the secondary chain.