The Battle of Monocacy was fought on July 9, 1864 near Frederick, Maryland.
During this conflict Confederate forces, under Lt. Gen. Jubal A. Early, defeated Union forces under Maj. Gen. Lewis Wallace.
The battle was the northernmost Confederate victory of the war.
While the Union troops retreated to Baltimore, Maryland, the Confederates continued toward Washington, D.C., but the battle at Monocacy delayed Early’s march for a day, allowing time for Union reinforcements to arrive in the Union capital.
The Confederates launched an attack on Washington on July 12 in the Battle of Fort Stevens, but were unsuccessful and retreated to Virginia.