MANSFIELD, JOSEPH KING FENNO (1803 62). An American soldier. He was horn in New Haven, Conn.. graduated second in his class at West Point in 1822, was assigned to the Engineer Corps as brevet second lieutenant, and during the next twenty-four years was engaged almost continuously on engineering work for the Gov ernment. his most important service being the construction of Fort Pulaski. for the defense of Savannah River. Ga., to which lie devoted most of his time between 1830 and 1846. During the Alexivan War he served throughout the north ern campaign as chief engineer under General Taylor. with the rank of captain, constructing and aiding in the defense of Fort Brown, taking a prominent part in the battle of Monterey (where he was wounded) and in the battle of Buena Vista. and receiving the successive brevets of major. lieutenant-colonel, and colonel. lie then served as a member of the Board of Engi neers for the Atlantic coast defense from March.
1848. to April. 1853. and of the board for the Pacific coast defenses from April to Slay, 1853, and from I853 to April, IS61, was inspector-gen eral of the United States Army with the rank of colonel. During the Civil War he was engaged in companies of volunteers at bus, Ohio. in April, 1861: commanded the De partment of front April to July, 1861; was appointed brigadier-general of volun teers in Slay; was in command of the city of Washington from July to October; then com manded successively at Camp Hamilton. Newport and Suffolk, Va.; captured Norfolk. Va.. on Slay 10, 1862: was raised to the rank of major-general in July: commanded a division in the Army of the Potomac during the Maryland campaign. and was mortally wounded at Antie tam on September 17, 1862.