Butler played a role in organizing the 13th Tennessee Union Cavalry, which he joined in 1862 as a Lieutenant Colonel.<ref name=johnsoncitypress/> He ultimately resigned his position a year prior to the war's conclusion due to health reasons. | Butler played a role in organizing the 13th Tennessee Union Cavalry, which he joined in 1862 as a Lieutenant Colonel.<ref name=johnsoncitypress/> He ultimately resigned his position a year prior to the war's conclusion due to health reasons. |