Taking out the semaphore is a dead giveaway of trouble in the rear area - the reasons it worked in the Canal Raid were 1) low traffic volume [nobody was talking to Siddar anymore, and none of the non-entities on the route had much to say or any need to hear anything]; 2) the ships were actually moving quite quickly [11 hours from Fairkyn to Ohlahrn, for ex], and even so they didn't stay ahead of the news, just close enough behind it to keep out of trouble; 3) nobody was expecting trouble, so no attention was paid to the anomalies that did appear. 1) & 3) certainly don't apply here, 2) probably doesn't.
You are also making some pretty wild assumptions about Ahlverez's ability to touch Hanth's river traffic - if there is any - without being caught at it almost immediately.
First, what makes you think he can even touch it? For all we know it's running along the west bank, not the east [there are a couple of simple tricks for crossing tow ropes that would let the barges pass each other at designated locations], and in the more likely case that it runs one direction on each bank, there's bugger all he can do about the traffic along the far bank, including keeping it from noticing what he's up to on the other side. Second, why on earth wouldn't that traffic be protected by vigorous patrols? Hanth knows perfectly well that Ahlverez is out there somewhere, since he wouldn't have even started to move out of Thesmar until he knew the trap had been sprung successfully, and he also knows that there _are_ loyalists still out there who could just take it into their heads to mess things up a bit - just for the sheer bloody-mindedness of it, of course. Patrols along both banks, even if just one is in use for transport, with the lads on the eastern side particularly charged to 'let me know when the temple boys turn up'. And, again, whatever - almost certainly nothing - he might manage to pull off with the first patrol or two to run into his screen, there's bugger all he can do about the folks across the river and what they can observe and report. He most definitely is _not_ swimming any forces across the river: from the evidence, they'd be dead halfway across.
Figure a downstream speed close to 20mph for Delthak. 250 miles is 13-15 _hours_. Add 24-30 hours to get the word upriver, and the Army of Shiloh has _2_ days. And that's assuming it hasn't been spotted and shadowed before it gets within 50 miles of the river.
There actually is reason to think that crossing rivers is seen as a tactical problem, not an engineering one: Safehold is _not_ antiquity. The roads are built to much better than Roman standards and the armies use them when they aren't following canals. And roads and canals built to better than Roman standards - there's no real equivalent to the road system in real-world history - come equipped with those marvelous devices called bridges. Take the bridge and you cross; hold the bridge and the other guy doesn't cross. Even with gunpowder, _blowing_ the bridge is more than your soul is worth and would never enter the equation.
n7axw wrote:Louis R wrote:Trouble is, with the obstacles out there's nowhere on the lower Seridahn that Delthak can't reach in about a day sailing with the current. Anything she's needed for in dealing with Rychtyr can be postponed long enough.
Figure 250 miles for Delthak. She will be at Evrtyn by the time she gets the news.
If Ahlverez takes rhe precaution of having his cavalry take out the semaphore before he shows himself on the river, I think it would be a week to 10 days maybe even longer before Hanth's supplies stop coming and he figures out that his supply line is cut. Figure two to two and a half days to get Delthak back down the river to where Ahlverez has interdicted his supplies.
Does it work? Maybe. I can see him divding his people down into shifts to work around the clock. Another thought might be to have him cutting down the trees prior to interdicting barges to minimize the time actually building the bridge.
Don.