 He was promoted to first sergeant on October 23, 1862, and regimental sergeant major on March 9, 1863.Fletcher was commissioned as a second lieutenant in Company C on April 23, 1863, to date from April 2.He took part in all the 16th Vermont's engagements, including the Battle of Gettysburg, and mustered out when the regiment's enlistments expired on August 10, 1863.