This is a good time to introduce Frederick H. Dyer's A Compendium of the War of the Rebellion. While not always absolutely accurate, it does include in vol. 2 a list of battles (and anything resembling a fight) divided by state and place and date. There is an alphabetical index of all places, and there is a section that gives the Union troops that participated (not the Confederate).

In this case, there is nothing listed for Prattville.