In July 1864, Confederate forces led by General Jubal Early attacked Fort Stevens and Fort DeRussy on the outskirts of Washington DC. Union forces drove them away after two days of skirmishes, but the battle threw a scare into the capital city and constituted a high point in the Confederacy's Shenandoah Valley campaigns.
More than a century and a half later, the Confederates are back in Washington, meeting stiff resistance on Capitol Hill but garnering support from the White House.