Fortifications

Fort Sumner (1861-1865) - First established as three independent earthworks forts in 1861 during the U.S. Civil War in Montgomery County, Maryland. Fort Ripley, Fort Alexander  and Fort Franklin combined into Fort Sumner in 1863. The individual forts were then classified as Redoubt Cross, Redoubt Davis and Redoubt Kirby respectively in 1864. Fort Sumner was named after Major General Edwin V. Sumner, who died at Syracuse, N. Y., 21 Mar 1863.  

First established as three independent earthworks forts in 1861, Fort Ripley (3), Fort Alexander (2) and Fort Franklin (4). These three works were connected by earthworks and combined into Fort Sumner in 1863. The individual forts were then classified as Redoubt Cross, Redoubt Davis and Redoubt Kirby respectively in 1864. The combined fortifications had a perimeter of 840 yards and mounted 30 guns.   Location:  Marker at Sangamore Road and Westpath Way, Bethesda, Montgomery County, Maryland.  ( Source - Fortwiki )