In early 1862 Edward joined his brother
Norwood Penrose "Pen" Hallowell, who was already serving in the
20th Massachusetts Volunteer Infantry. He served as a lieutenant. While he was in the 20th, the regiment saw considerable action including the
Peninsula Campaign, the
Seven Days,
Antietam and
Fredericksburg. Lt. Edward Hallowell then accepted an appointment in the 54th Massachusetts, which was to be led by
Robert Gould Shaw as colonel and his brother Norwood as lieutenant colonel. The regiment was to be made up of white and black abolitionists fighting together for black freedom. Edward recruited African-American soldiers in Philadelphia and was actually the first officer to occupy the barracks set aside for the 54th at Camp Meigs in Reedville. Recruiting for the regiment proved so successful that a second regiment, the 55th, was formed. Norwood Hallowell was designated as the 55th's colonel and Edward was promoted to major and was second-in-command to Shaw. By the time of the famous assault by the 54th on
Fort Wagner Hallowell was promoted to lieutenant colonel. In the assault on Fort Wagner he commanded the left wing with half the regiment's companies. Because of the narrow
defile through which the 54th had to pass the left wing was deployed directly behind Shaw and the right wing. Hallowell suffered three wounds in the assault and went home to recuperate. Upon returning he commanded the 54th as a full colonel for the rest of the war, except when he was in temporary command of a brigade. The 54th and Hallowell continued to serve with distinction during the war. He fought at the
Battle of Olustee, the
Battle of Honey Hill and the
Battle of Boykin's Mill. At Boykin's Mill, Hallowell was in command of Major General Potter's 3rd Brigade. When the fortifications around Charleston fell along with the city it was the 54th under Hallowell that occupied various former Confederate posts including
Fort Sumter and Fort Wagner. Additionally, the 54th guarded Confederate prisoners of war during this time, including some whom they had faced at Fort Wagner. ==Post War years==