Misfit_travel
Emperor
Originally posted by Klyden
I think you mentioned it, but I wanted to confirm that garrison units can see the irregulars. This will allow the AI to effectively police a later game attack in the North by several of these units, should they be constructed on the eastern part of the map.
The only units that can see irregulars are those with "see invisible" ability. That would be cavalry, scouts, raiders and infiltrators. Garrison units are the dregs of the army. They are immobile units of substandard capability. I don't think giving them an advantage like "see invisible" would represent them fairly historically.
It would also mean that you couldn't sneak up on any major city, since most of them have garrison units assigned to them. There is a certain amount of fun as the human player in launching a sneak attack.
I have yet to see a player build a massive number of irregulars / guerrillas / raiders and use them in the manner you have described. They are too expensive (relative to main line infantry) to build in sizable numbers. That doesn't mean it isn't possible, its just all it takes it one cavalry unit in the area to spoil the sneak attack. Once the AI sees the units, it does respond to them.
BTW, in V3.x of ACW I ran into the Union AI building stacks of Raiders and attacking me in Virginia with them. It was a novel experience for me, because I had lost my cavalry by then and hadn't bothered to build any more. The Union took 4 cities before I could stop them. I think the AI is capable of using these invisible units effectively from time to time, so it might keep a human player on his toes.
Regards
Misfit