Fern wrote:OTOH gunboats (most of the time Union ones) cancel river crossings in non-contested river sectors. I think it is another game compromise which compensates for the CSA capability to cross any river anywhere anytime. It is supported by the real facts because it seems there is no record of a sizeable ACW army daring to cross a big river in face of enemy riverine forces.
From my reading completely unopposed forces in the CW did cross rivers pretty much at will. Certainly within a 15 day stretch, even if the river was in flood during part or all of that time. This is supported by facts.
Fern wrote:Moreover. According to 1.10 an Union player (rivers are mostly controlled by the Union) must have 4 gunboats in a river sector in order to cancel enemy crossing capability. It would be more realistic to allow him to patrol a sector with one or two gunboats and cancel any river crossing provided enough friendly riverine forces were based in an adjacent sector, even if they were inside a port because those forces could heavily reinforce those patrolling gunboats in a short time. CW Generals knew it., that's the reason they did not cross rivers facing enemy riverine forces. It was TOO dangerous. In the game it is NOT dangerous at all because forces cannot be split between two banks, cannot be stopped cold while crossing leaving some of the forces in the wrong bank of the river, enemy riverine forces in a sector cannot be reinforced by forces in adjacent sectors (or inside a port in the same sector) etc.
In the game it is not dangerous at all because gunboat patrols are not dangerous or porous. I fail to see how stopping crossings completely makes it more dangerous, other than as a dangerous (and IMO unrealistic) abstraction. However, if gunboat patrols were
made dangerous to forces crossing rivers, it would allow for situations where different stacks in the same army could wind up on opposite sides of a river with low cohesion. If this wouldn't be a deterrent, I don't know what would.
Saying it was not done (which I concede) is not sufficient IMO to go from deterrence to total interdiction. Gunboats deterred land forces from crossing rivers, they did not stop land forces from crossing rivers. It's like the Cold War. The US and USSR were not physically incapable of launching nuclear missiles at each other. They didn't do it, for fifty years. However, removing the ability to launch nuclear missiles from a model of the Cold War, even though supported by that historical fact, would be a very dangerous abstraction.
I expect this will be paraphrased as: Jabberwock says "Not launching nuclear missiles is dangerous."

Just another reason for "normal" people to think I'm nuts.
Fern wrote:They are game compromises and I think they are pretty good chosen ones.
Naval warfare is one of the most abstract parts of this game, and while it should never be the primary focus of the game, and I (as a programmer) certainly recognize the need for easy fixes and compromises, it is (IMO) one of the areas of the game that could most stand improvement.
Fern wrote:In fact I would allow riverine units in a port to interdict crossing movements in their sector as long there was just ONE gunboat element out of the port patrolling the river sector because the forces inside port would be naval reserves available to reinforce the patrolling forces in a VERY short time.
I don't think anyone has suggested steaming-to-the-sound-of-the-guns before, although the way it is proposed, it is more of a steaming-to-the-lack-of-sound-of-the-guns. Good original thought there. I think we should bounce that idea around a bit.
Fern wrote:Neither would I force patrolling gunboats to be on attack mode. Defensive mode would be enough.
I think this is a proposed easy fix forced by other compromise choices. If we stick with total interdiction, then they need to be in attack mode.
Fern wrote:In short, I don't know if it would be doable, but in order to deny crossing capability to an enemy force I would suggest to force the river controlling player to have 6 or 8 elements (ironclads would count as 2 elements each), but forces in adjacent river sectors, even if they are inside a port and in passive mode, would be counted for the total. If if was not doable, then I would leave things as they are.
Saying we shouldn't change things unless we can do it in a way that is probably inconvenient, could be more simply stated as the opinion that we shouldn't change things. However, combining your idea of supporting naval elements with the idea of contested crossings, is likely to be more doable, because it could be modeled on the pre-existing march-to-the-guns code. That deserves further consideration.