Benjamin was born on January 3, 1839, in New York City. He was the son of William Massena Benjamin (1800–1862) and Sarah Jane (née Turk) Benjamin (1805–1903). His siblings included Edith Massena Benjamin, Sarah Josephine Benjamin Arnold, and Laura Gertrude Benjamin Brooks.
Following the Civil War, he served at West Point and in the Adjutant General Corps.
Medal of Honor citation
He received his Medal of Honor on June 11, 1877, for his service from Bull Run to Spotsylvania, Va. over the period from July 1861 to May 1864.[1] The citation stated: "Particularly distinguished services as an artillery officer."[2] His rank and organization were First Lieutenant, 2d U.S. Artillery.[2]
Elizabeth d'Hauteville Benjamin (1871–1884), who died young.
William Massena Benjamin (1874–1928),[4] who married Charlotte Hoffman Prime (1881–1969),[5] the great-granddaughter of Nathaniel Prime,[6][7] in 1903.[8]
Hamilton Fish Benjamin (1877–1938),[9] a twin who married Emily Low Bacon (1884–1960) in 1909.[b] They divorced in 1923 and he married Ruth Wolfe (1890–1984),[c] in 1932.[11]
Through his son William,[5] he was the grandfather of Charlotte Prime Benjamin, (1904–2002), who married Richard Morris Carver in 1925;[13] Elizabeth Fish Benjamin (1906–1976), who married William McLane in 1928;[14] Julia Kean Benjamin (1908–1983); William Hoffman Benjamin (1910–1997); Emily Stuyvesant Benjamin (1913–2000); Samuel Nicoll Benjamin (1915–2006); Mary Benjamin; Sarah Morris Benjamin; and Hamilton Fish Benjamin II (1921–1984).[7]