A quick glance at the battlefield above makes you wish you any other force than cavalry for this battle. The enemy will come to us walking down a slope, crossing the Willoughby run and then climbing up towards the McPherson's ridge. Is there a better kill zone than this? Tactical advantage is in the muzzle of the gun holder, though, and with the forces available, this is not going to be pretty.
For starters, there is the issue of weapons range. Back in the American Civil War, the troopers were armed with carbines that, despite being able to deliver higher firing rates than the infantry muskets, had shorter ranges and less stopping power. Second, there is the issue of limited numbers: cavalry formations were in the receiving end of the attrition equation. If there is an advantage that the US troopers have in this scenario, that is mobility.
Deviating my tactics from the ones used in the historical battle, and eager to catch the enemy infantry with their pants down while they cross the Willoughby run, I deploy my line of defense between the McPherson ridge and the run. I count on my troopers mobility to disengage and rapidly fall back towards the ridge. I even move my artillery battery forward.
I will go through my line of defense from left to right flank. Please refer to the above birds eye view of the battlefield to follow.
In the extreme left flank the 12th Illinois Cav. Regt. deployed within the McPherson's woods. This terrain is ideal for a cavalry-based defense as the woods provide cover to fire and concealment to withdraw. Note that the "8th New York Cavalry" text in the info panel actually refers to another unit I have clicked but moved away from to take this screenshot.