Samuel P. Heintzelman (1805-1880) - Born 30 Sep 1805 in Manheim, Pennsylvania. A career U.S. Army Infantry Officer and United States Military Academy graduate. Retired 22 Feb 1869 as a Major General. Died 1 May 1880 in Washington DC. Buried in Forest Lawn Cemetery in Buffalo, New York.
He entered the United States Military Academy and graduated in the Class of 1826 ranking 17th out of 41
He served in the Second Seminole War in Florida, the Mexican War (1847-1848) in Texas and Mexico, and the U.S. Civil War (1861-1865). He retired on 22 Feb 1869 with the rank of Major General after 47 years of service at age 64.
General Heintzelman died 1 May 1880 in Washington DC and is buried in Section T, Lot 7, West in Forest Lawn Cemetery, Buffalo, New York.
Father: Peter James Heintzelman (1768-1824)
Mother: Ann Elizabeth Grubb (1774-1812)
- Margaret Stuart (1819-1893) married 5 Dec 1844, born 1 Dec 1819, died 9 Aug 1893
- Juliana Heintzelman
- Charles Stuart Heintzelman (1845-1881) born 29 Dec 1845, died 27 Feb 1881
- Mary Lathrop Heintzelman (1848-1927) born 27 Feb 1848, died 24 Mar 1927
- Henry Summers Heintzelman (1857-1858) born 1857, died 12 Feb 1858
- 1822-1826) Cadet, United States Military Academy
- (1826-1827) 2nd Lt. (1 Jul 1826), 2nd U.S. Infantry, Jefferson Barracks, Missouri
- (1827-1828) 2nd U.S. Infantry, Fort Mackinac, Michigan
- (1828-1831) 2nd U.S. Infantry, Fort Gratiot, Michigan
- (1832-1834) 1st Lt. (4 Mar 1833), 2nd U.S. Infantry, On topographical duty
- (1834-1835) 2nd U.S. Infantry, Fort Brady, Wisconsin
- (1835-1837) Capt. (4 Nov 1838), 2nd U.S. Infantry, Second Seminole War, Florida
- (1837-1838) 2nd U.S. Infantry, Columbus, Georgia
- (1838-1841) 2nd U.S. Infantry, Second Seminole War, Florida
- (1841-1842) 2nd U.S. Infantry, Florida Militia War Claims Investigation
- (1843-1845) 2nd U.S. Infantry, Buffalo, New York
- (1845-1846) 2nd U.S. Infantry, Detroit, Michigan
- (1846-1847) 2nd U.S. Infantry, Louisville, Kentucky
- (1847-1848) Bvt. Major (9 Oct 1847), 2nd U.S. Infantry, Mexican War
- (1848-1848) 2nd U.S. Infantry, Jefferson Barracks, Missouri and Fort Hamilton (1), New York
- (1848-1849) 2nd U.S. Infantry, Voyage to California
- (1849-1850) 2nd U.S. Infantry, Frontier duty at San Diego Barracks, California
- (1851-1853) Bvt. Lt. Colonel 2nd U.S. Infantry, Fort Yuma, California
- (1853-1854) 2nd U.S. Infantry, Command of Southern District of California
- (1854-1855) 2nd U.S. Infantry, On recruiting duty
- (1855-1855) Major (3 Mar 1855), 1st U.S. Infantry, Jefferson Barracks, Missouri
- (1855-1857) Superintendent of Western Recruiting Service
- (1857-1859) Leave of Absence
- (1859-1860) 1st U.S. Infantry, Fort Duncan, Texas; Camp Verde (3), Texas and Fort Brown, Texas
- (1860-1861) Leave of Absence
- (1861-1865) Union, U.S. Civil War, Colonel (14 May 1861), 17th Infantry; Brigadier General U.S. Volunteers (17 may 1861), Major General U.S. Volunteers (5 May 1862), Bvt. Brigadier General U.S. Army (31 May 1862), Bvt. Major General U.S. Army (13 Mar 1865), Mustered out of Volunteer Service 24 Aug 1865.
- (1865-1866) 17th U.S. Infantry, Hart Island, New York
- (1866-1867) Various posts in Texas
- (1867-1869) Various boards and leave of absence
- (1869) Retired form active service 22 Feb 1869 as a Major General
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