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R.B. Marcy
R.B. Marcy

Federal (USA)

Brigadier General

Randolph Barnes Marcy

(1812 - 1887)
Home State: Massachusetts
Command Billet: Inspector General, AOP
Branch of Service: Infantry
Unit: Army of the Potomac


Before the Antietam Campaign:
On Graduation from West Point, July 1, 1832, he was brevetted a second lieutenant in the Fifth Infantry, perm 2nd. Lt 25 November 1835, 1st Lt 22 June 1837, and to Captain on 18 May 1846. With the exception of two brief tours as a recruiting officer in the East, he spent this period on the northwest frontier in Michigan and Wisconsin.

During the Mexican War he saw action at the battles of Palo Alto and Resaca de la Palma. Again detached for recruiting duty, Marcy returned to Texas in 1847, and in 1849 he determined the route of the Marcy Trail, from Fort Smith to Santa Fe. In 1851 he commanded Gen. William G. Belknap's escort on the tour that selected the sites for forts on the Texas frontier.

In March 1852 Marcy was assigned the command of a seventy-man exploring expedition across the Great Plains in search of the source of the Red River and directed to "collect and report everything that may be useful or interesting." Second in command of the Marcy expedition was Capt. George B. McClellan. Marcy's 1852 expedition has been called the most significant of his career and "the best organized, best conducted, and most successful" venture into the region to that date.

With the outbreak of the Civil War, he was promoted to Colonel and named Inspector General of McClellan's Army of the Potomac. From September 23, 1861, through July 17, 1862, and again from September 13, 1862, through March 4, 1863, he served as acting Brigadier General of Volunteers.

In the Antietam Campaign:
He served as Gen McClellan's Chief of Staff.

After the War:
From 1863 through 1878 he served as Inspector General of various departments of the army, and on December 12, 1878, he was promoted to the regular rank of Brigadier General and was named Inspector General of the US Army. He retired from the army on January 2, 1881

References, Sources, and other notes:
He was Gen McClellan's father-in-law. McClellan married Marcy's daughter Mary Ellen on May 22, 1860.

Sources: Heitman, Francis Historical Register and Dictionary of the United States Army 1789-1903, Washington, US Government Printing Office, 1903.; and
a biography from The Handbook of Texas Online, from UTexas. The photo above is from a CDV offered for sale by Jeff Krauss.

Birth Date: 4/9/1812    Place of Birth: Greenwich, MA    
College: US Military Academy, West Point, NY    Graduating Year: 1832    Class Rank: 29th
Death Date: 11/22/1887    Death Place: West Orange, NJ    Burial Place: Riverview Cemetery, Trenton, NJ

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