Ft. Stevens

July 11-12, 1864, Jubal Early attacks Washington, D.C., hoping to force Grant, who is threatening Richmond, to leave Virginia and defend Washington.
…
Although Early caused consternation in the Union government, the strong defenses of Fort Stevens minimized the military threat and Early withdrew after two days of skirmishing without attempting any serious assaults. The battle is noted for the personal presence of President Abraham Lincoln observing the fighting.
…
Union defenders of Washington, D.C. include the 145th Ohio Volunteer Infantry. They were probably stationed on the Virginia side of the city.