On 21 April 1865, Mosby’s Raiders disbanded without formally surrendering.
John Mosby was a Confederate leader nicknamed “The Gray Ghost” for his hit-and-run raids on US facilities. His Raiders or Rangers were a group of guerrilla secessionists who did not wear uniforms, just one or more items of gray clothing. They would attack without warning, retreat as soon as battle turned against them, and destroy rail lines and bridges before disappearing back into the civilian population. They also performed spying missions.
After the war, Mosby switched sides, joining the Republican Party and serving in Ulysses S Grant’s Presidential administration.