There was a good deal of discussion on Rantings of a Civil War Historian last week about cavalry in the Western Theater. While the majority of the Regular regiments served in the Eastern Theater, there was a good bit of Regular action in the west as well, particularly involving the 3rd and 4th US Cavalry. Elements of several regiments were involved in early battles such as Wilson’s Creek and Valverde, as companies tried to return to their consolidating regiments.
The 3rd Cavalry served in New Mexico the first two years of the war, then spent 1863 fighting in Tennessee and Alabama. They fought in Arkansas in 1864, then the Chattanooga campaign.
Split between theaters in the early stages of the war, the 4th Cavalry eventually consolidated in the Western Theater and fought the remainder of the war there. Major battles that they participated in (not in order) include: Wilson’s Creek, Murfreesboro, Chickamauga, Atlanta, Franklin, Nashville, Mississippi, Tennessee, Alabama and Georgia.
So the Western Theater will definitely be addressed here, I’m just not sure when.