He taught engineering at the Military Academy ( 1843 -- 46 ) and constructed fortifications along the Atlantic coast and Great Lakes ( 1846 -- 52 ) .
He ranked second in the United States Military Academy class of 1842 and was commissioned in the Corps of Engineers .
He taught engineering at the United States Military Academy   ( 1843 -- 46 ) and constructed fortifications along the Atlantic coast and Great Lakes ( 1846 -- 52 ) .
He ranked second in the United States Military Academy class of 1842 and was commissioned in the Corps of Engineers .