I apologize for taking so long with dynamic garrisons, and I can only say that today delayed things even further.
Today, I instead worked on diversifying battle mechanics more, including introducing a greater variety of shot trajectories (Particularly for flaming shot, heavy shot, and slings. Slings now have options when it comes to shot types, which mostly vary based on rate of fire, and firing trajectory.)
Skirmishing feels so much better with these changes.