"Biographical Register of the Officers and Graduates of the U.S. Military Academy at West Point, N. Y. " by George Washington Cullum, published 1891
Born in New York, William C. De Hart was a Cadet of the Military Academy from Sep. 30, 1814, to July 1, 1820, when he was graduated and promoted in the Army. He served on Ordnance duty, July 1, 1820, to Aug. 20, 1822; in garrison at Plattsburg, n. Y., 1822-24, and New York harbor, 1824-26; on Recruiting service, 1826; in garrison at Ft. Columbus, N. Y., 1826-27, Savannah, Ga., 1827-28, Ft. Monroe, Va., (Artillery School for Practice), 1828, and Ft. Johnston, N. C., 1828-29; on Courts Martial, 1830-31; as Aide-de-Camp to Major-General Scott, Jan. 3, 1831, to Apr. 2, 1838; on Special duty on the Northern Frontier, 1838-39, during Canada Border Disturbances; as Acting Judge Advocate of the Army, Nov. 8, 1839, to Nov. 9, 1842; in garrison at Ft. Columbus, N. Y., 1842-45; on Special duty, preparing his 'Observations on military Law, and the Constitution and Practice of Courts Martial,' Feb. 6, 1845, to Jan. 12, 1847; in the War with Mexico, 1847, being engaged in the Siege of Vera Cruz, Mar. 9-29, 1847, Battle of Cerro Gordo, Apr. 17-18, 1847, Skirmish of Amazoque, May 14, 1847, and Defense of Puebla, Sep. 13-Oct. 12, 1847, of which he was lieut. Governor, Aug. 6 to Oct. 23, 1847; and on sick leave of absence, 1847-48
Died, Apr. 21, 1848, at Elizabethtown, N. J.: Aged 48
3d Lieut., Ordnance, July 1, 1829
2d Lieut., 2d Artillery, in Re-Organization of Army, June 1, 1821, to Rank from July 1, 1820
Bvt. 1st Lieut., July 1, 1830 for Faithful Service Ten Years in one Grade
1st Lieut., 2d Artillery, Oct. 10, 1831
Captain, 2d Artillery, Apr. 3, 1838
Contributed by Graves (#47171280).
48y, "A Captain in the Second Regiment of U. S. Artillery who whilst on service in Mexico contracted the illness of which he died in this Town."
Mary H Vanderveer DeHart
1811–1898 (m. 1834)