The example is taken from maryland SVF 2.0 reworked events, on a old version. The number of Confederate rebels have been toned down since, even if the basics remain the same.
Union AI didn’t enforced martial law, opening the possibility of Confederate guerilla in Maryland ( a rare case ).

Let’s study the pic.
Units with Leaders in black
Cells are representing not underground structures, but rather propension of the population to wage guerilla against Union. As much they remain, they form local forces a player can’t use far from their home region, local partisans fighting on their ground and for their ground… They are a nuisance, not only in MAryland, but in Missouri, in Tennessee, in Arkansas.
The best point if you look at the bottom of the map is the capacity of the union AI to wage war against cells.
Available in PBEM too of course…









