Daniel Webster Flagler Daniel Webster Flagler ( June 20 , 1835 – March 29 , 1899 ) was a United States Army Brigadier General . He was prominent as the Army ' s Chief of Ordnance . Early life . Flagler was appointed to the United States Military Academy in 1856 . He graduated fifth in the class of 1861 and was appointed a Second Lieutenant of Ordnance . Civil War . Flagler ' s first Civil War assignment was to teach drill and ceremony and other basic skills to newly raised volunteers in Washington , D . C . He served as aide to David Hunter in the Manassas Campaign , and fought during the First Battle of Bull Run . He next served as aide to Irvin McDowell in the defense of Washington . After serving at the Allegheny Arsenal he participated in Ambrose Burnside ’ s North Carolina expedition . Flagler took part in the capture of Roanoke Island , the attack of New Bern , and the capture of Fort Macon . Next assigned to the Army of the Potomac , Flagler took part in the Maryland Campaign , including the Battle of South Mountain . Flagler also participated in the battles of Antietam , Fredericksburg , Chancellorsville , and Gettysburg . Flagler was assigned to inspection duty at the West Point Foundry in October , 1863 and remained there until May , 1864 . He was then transferred to the Army ' s Ordnance office in Washington , where he remained until June , 1865 . A Captain at the end of the war , Flagler was a brevet Lieutenant Colonel , having received three honorary promotions — one for valor at New Bern , one for meritorious service at Fort Macon , and one for distinguished service to the Ordnance Department throughout the war . Post Civil War . Recognized as an expert on developing and producing artillery and other weapons , Flagler continued his Ordnance service after the war , including assignments at the Watervliet , Augusta , Rock Island , Fort Monroe , Fort Union , San Antonio , Frankford , and Watertown arsenals . In 1877 Flagler authored " A History of the Rock Island Aresenal " . In January , 1891 he was promoted to Brigadier General and assigned as Chief of Ordnance , holding this assignment until his death . Death and burial . General Flagler died at the Hygeia Hotel , a resort where he had gone in an effort to recover his health after suffering from rheumatism and other ailments . He was buried at Arlington National Cemetery , Section West E , Site 147 . Daniel W . Flagler and his wife are memorialized on one side of the grave marker , and General Clement Flagler and his wife are memorialized on the other . Family . On September 13 , 1865 Flagler married Mary McCalla Finley , the daughter of Brigadier General Clement Alexander Finley . Their children included a daughter , Elizabeth ( 1866 - 1939 ) and a son , Clement ( 1867 - 1922 ) . Clement Arthur Finley Flagler was a career Army officer who attained the rank of Major General as a division commander in World War I . In 1895 Elizabeth Flagler was found guilty of manslaughter after she shot and killed a fifteen - year - old African American boy , one of several who she fired a pistol at when she observed them stealing pears from her father ' s garden . Following her conviction she served three hours in the District of Columbia jail and paid a fine of $ 500 . In 1901 she married Doctor George W . MacKean of Nova Scotia . Other . Fort Flagler on Marrowstone Island in Washington was named for him . The site is now a state park and is listed on the National Register of Historic Places . Flagler Place Northwest in the Bloomingdale neighborhood of Washington , D . C . is named for him .