This screen shot will give you an idea of how difficult it is to even see a soldier much less shoot one. This is a shot from new South Mountain scenarios. I believe it was Garland's defense of Fox Gap.
There is a group of confederates charging but are partially hidden by the rocks right above the end of my bayonet. Further behind them is a fence line they were lined up behind and you may be able to see the flag there. I waited until they were as close as the small tree in front of my rifle before I shot one. They are probably at 100 yards.
https://steamcommunity.com/sharedfiles/filedetails/?id=1759468634Couldn't get img to work so just click on the url link to screen shot.