166th Ohio Infantry Regiment

Organized at Camp Cleveland, Ohio

May 13, 1864

960 men were mustered in under Colonel Harrison G. Blake

May 15

Left State for Washington, D.C. Attached to 2nd Brigade, DeRussy's Division, 22nd Army Corps.

July

Assigned to duty as garrison at Forts Richardson, Barnard, Reynolds, Ward and Worth (Headquarters at Fort Richardson), Defenses of Washington south of the Potomac. Attached to 3rd Brigade, DeRussy's Division, 22nd Army Corps.

July 11-12

Repulse of Early's attack on Washington

September 9, 1864

Mustered out