High Quality Content by WIKIPEDIA articles! Walker Keith Armistead (1785 October 13, 1845) was a military officer who served as Chief of Engineers of the United States Army Corps of Engineers.He was born in Virginia. During the War of 1812, he was successively Chief Engineer of the Niagara frontier army and the forces defending Chesapeake Bay. He was promoted to colonel and Chief Engineer on November 12, 1818. When the Army was reorganized on June 1, 1821, he became commander of the 3d Artillery. He was brevetted brigadier general in 1828. He succeeded Zachary Taylor as commander of the army during the Second Seminole War against the Seminole Indians in Florida in 1840 1841.Armistead died in Upperville, Virginia.