Colonel Mansfield visited Fort Steilacoom twice as inspector general, the first time in 1854 and again in 1858. Mansfield graduated second in his class at the USMA in 1822 and he served in the Army’s Topographical Engineer Corps.
By the time of the Mexican War in 1846, Captain Mansfield served as General Taylor’s chief engineer. Throughout the 1850s, Colonel Mansfield served in several departments across the continent as a staff officer and inspector general.
Promoted to major general of volunteer troops during the Civil War, General Mansfield would be mortally wounded at Antietam leading his XII Corps across the East Woods. He died the next day, on Sept. 18, 1862.