Just a heads up, Gordon wore Union Blue. He was in the Union army (1st Tennessee Volunteer Cavalry) for Sherman's march, and it was a lot of torching homes and looting Savannah and other pleasant episodes. Sherman believed in total war and stripped the South in the process of marching down to take pressure off Grant. He devastated the South in its ability to support the war materially and psychologically with scorched earth policies. Definitely an East Tennessee unionist.

After that, the Indian Wars. Where he employed methods he learned as a regimental officer and then staff aide to William Tecumseh Sherman.

Incidentally, yes, 7th cavalry, but he took a bullet wound and was recovering and so missed Little Bighorn. Just as well, but he still misses Custer.