William Abram Mann (July 31, 1854 – October 8, 1934) was a general officer in the United States Army. He served as the commander of the 17th Infantry Brigade in the Spanish–American War and the 42nd Division ("The Rainbow Division") in World War I.

Quick Facts Born, Died ...

William Abram Mann
Mann circa 1916, at about the time of his assignment as commandant of the School of Musketry.
Born	(1854-07-31)July 31, 1854 Altoona, Pennsylvania
Died	October 8, 1934(1934-10-08) (aged 80) Washington, D.C.
Place of burial	Arlington National Cemetery
Allegiance	United States of America
Service/branch	United States Army
Years of service	1875–1918
Rank	Major General
Service number	0-13117
Commands held	6th Infantry Regiment Department of Dakota Recruit Depot, Jefferson Barracks, Missouri 3rd Infantry Regiment 1st Brigade, Department of the East 2nd Cavalry Brigade School of Musketry and Field Artillery Militia Bureau 42nd Division Department of the East
Battles/wars	American Indian Wars Spanish–American War Pancho Villa Expedition World War I
Awards	Silver Star
Other work	Executive, Equitable Trust Company of New York

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After he retired from military service, he became an executive at the Equitable Trust Company of New York. He resided in Washington D.C., until his death on October 8, 1934.

A World War II troop carrier was named for him. The USS W. A. Mann (AP-112), was commissioned in 1943 and served in World War II, the Korean War, and the Vietnam War.

Mann was born on July 31, 1854, in Altoona, Pennsylvania, the son of Anna (Bockus) Mann and Charles J. Mann.^[1] Charles J. Mann was an attorney and judge, and served as mayor of Altoona from 1884 to 1886.^[1] William A. Mann attended the schools of Altoona and obtained an appointment to the United States Military Academy. He graduated in 1875^[2] and received a commission as a second lieutenant of Infantry.^[3][4]

He served in the western United States throughout the 1870 and 1880s, mostly in assignments with the 7th Cavalry. As part of the 17th Infantry Regiment, he took part in the Sioux Indian campaign of 1890 to 1891.^[5]

Mann served with the 17th Infantry Regiment in the Spanish–American War, participating in the Battle of El Caney and the Siege of Santiago.^[6] He received a Silver Star for gallantry in action at El Caney.^[7] Mann also served in the Philippines in 1899 and the early 1900s.^[8] He graduated from the Army War College in 1905.^[9]

From 1907 to 1909 Mann commanded the 6th Infantry Regiment at Fort William Henry Harrison, Montana, also temporarily commanding the Department of Dakota on several occasions. From 1910 to 1911 he commanded the Recruit Depot at Jefferson Barracks, Missouri.^[10]

In 1911 he was assigned to the Army's General Staff, and from 1912 to 1913 he was chief of staff for the Eastern Department in New York City. He served as chief of staff for the division based in Texas City, Texas from 1913 to 1914.^[11]

From 1914 to 1915 Mann commanded the 3rd Infantry Regiment at Madison Barracks, New York, and in 1915 he was assigned as commander of 1st Brigade, Department of the East in Albany, New York, receiving promotion to brigadier general.^[12][13]

In 1916 General Mann assumed command of the 2nd Cavalry Brigade in Texas during the Pancho Villa Expedition, and later took command of the School of Musketry and Field Artillery at Fort Sill, Oklahoma.^[14]

In 1917 he was named to head the Army's Militia Bureau (now the National Guard Bureau), receiving promotion to major general.^[15]

Mann left the Militia Bureau in 1917 to organize and train a division for overseas serviceand was succeeded by Jesse McI. Carter. He became the first commander of the 42nd Division, nicknamed the Rainbow Division, which was composed of National Guard units from 26 states and the District of Columbia. The 42nd Division's activation was important in the development of the National Guard because it was the first time National Guard units from multiple states were organized together and it was the first time smaller Guard units were formed into a division.^[16][17][18]

Mann was within a year of mandatory retirement in November 1917, by which time he and his division had arrived in St. Nazaire, France, where it became part of the American Expeditionary Forces (AEF).^[19] He began to suffer from poor health after the organization moved to its new location at Vaucouleurs in Lorraine, making chief of staff Colonel Douglas MacArthur the de facto commander.^[20] After Mann's superior, General John J. Pershing, Commander-in-Chief (C-in-C) of the AEF, made an on-site visit and observed Mann's infirmities, he cabled the War Department requesting that Mann be relieved.^[21][22] Mann was relieved in command of the 42nd by Major General Charles T. Menoher, a West Point classmate of Pershing's, and soon returned to the United States and commanded the Department of the East until he retired from the army in July 1918.^[23][24]

After leaving the military Mann became an executive at the Equitable Trust Company of New York.^[25]

In retirement Mann resided in Washington, D.C., and he died there on October 8, 1934.^[26] He was buried at Arlington National Cemetery, Section 3, Site 1996.^[27]

On September 10, 1884 Mann married Elsie Moir (1862-1936) of Elora, Ontario.^[28] They remained married until his death and had no children.^[1]

• Distinguished Service Medal
• Silver Star
• Indian Campaign Medal
• Spanish Campaign Medal
• Mexican Border Service Medal
• World War I Victory Medal

The USS General W. A. Mann (AP-112), a World War II troop carrier, was named for him. The General Mann was commissioned in 1943, used in World War II, the Korean War and the Vietnam War, and remained in service until 1965.^[29]