 Complete the following phrase:  In 1862, Hobart left the 4th Infantry to accept promotion to Lieutet Colonel with the newly organized 21st Wisconsin Volunteer Infantry Regiment. The regiment left Wisconsin in September 1862, but Hobart would not rendezvous with them until a month later due to travel time from Louisiana. Before Hobarts arrival, the 21st had marched to join the Army of Ohio, which had been carrying out a defense against the 