On August 3 , 1861 , he was transferred to the 4th U.S. Cavalry Regiment .
At the outset of the war , on May 24 , 1861 , Long was promoted to captain in the 1st U.S. Cavalry .
On August 3 , 1861 , Long was transferred to the 4th U.S. Cavalry Regiment .
At the outset of the war , on May 24 , 1861 , Long was promoted to captain in the 1st U.S. Cavalry .