 After it became apparent that the forces under the command of Confederate general Jubal Early were moving further north, the additional troops at Fort Corcoran marched northward to counter them.In August 1864, the 10th New York Heavy Artillery Regiment manned the defenses of Fort Corcoran.On April 18, 1865, the garrison at Fort Corcoran participated in a national salute to President Lincoln, who had been assassinated four days prior.