The soldiers died at Fort Stevens, the only Civil War battle within the borders of the District. Confederate troops under Jubal Early crossed the Potomac west of Washington, engaged federal troops at the Monocacy River near Frederick, Md., then came south to the Capital where they were repelled at the city's northern defenses.
The National Battleground Cemetery is along what's now Georgia Avenue in Northwest Washington near Fort Stevens Park. It was dedicated in 1864 by President Abraham Lincoln.
The cemetery has been undergoing renovations and will be rededicated Saturday at 11 a.m. with a salute from a U.S. Army color guard.