Civil War Defenses of Washington
The Civil War Defenses of Washington were a group of Union Army fortifications that protected the federal capital city , Washington , D . C . , from invasion by the Confederate States Army during the American Civil War ( see Washington , D . C . , in the American Civil War ) . 
<triplet> Civil War Defenses of Washington <subj> Washington, D.C. <obj> located in the administrative territorial entity <subj> Washington, D.C., in the American Civil War <obj> facet of <triplet> Union Army <subj> American Civil War <obj> conflict <triplet> Confederate States Army <subj> American Civil War <obj> conflict <triplet> Washington, D.C., in the American Civil War <subj> American Civil War <obj> facet of