After Freeman died before he could complete his biography, Carroll and Mary Wells Ashworth co-wrote the 1957 book George Washington Volume VII: First in Peace.
[1] Carroll began his career with the United States Navy during World War II.
In 1941, he was one of the survivors of the USS California sinking at Pearl Harbor and later received a Purple Heart medal.
[2][3] When Douglas Southall Freeman started his 1948 biography on George Washington, Carroll worked for him as a researcher.
[12][13] Outside of his teaching career, Carroll was a co-writer of Home of the Brave: A Patriot's Guide to American History in 1976.