[4] With the war over due to the Armistice with Germany in November 1918, Brown's post-war assignments included Professor of Military Science at Riverside Military Academy in Gainesville, Georgia, and postings as a company commander and regimental Plans, Operations and Training (S3) staff officer for the 45th Infantry Regiment in the Philippines.

[16][10] He remained in this position until January 1943 when he was reassigned to be the new commanding general (CG) of the 28th Infantry Division, an Army National Guard formation.

Brown received yet another promotion, the third since December 1941 and America's entry into the war, this time to major general (AUS), on March 15, 1943.

Major General Charles H. Corlett, then commanding the XIX Corps, thought Brown needed leave for medical reasons because he was sick and "rundown."

Bradley, now a lieutenant general, commanding the U.S. 12th Army Group, and Eisenhower believed Brown was personally brave, but not an inspirational leader, and that his soldiers under-performed as a result.

[18] Brown was replaced by James Edward Wharton, who was killed by a sniper while visiting his front line units soon after he took command.

Wharton, in turn, was replaced by Brigadier General Norman Cota, who had distinguished himself under fire on D-Day and was highly regarded by his superiors.