The 4th Ohio did not see significant combat until the Overland Campaign, fighting at the battles of the Wilderness and Spotsylvania Court House in May. After a series of smaller engagements, the 4th was a part of an ill-advised charge against Confederate entrenchments at the futile Battle of Cold Harbor in June. They participated in the Siege of Petersburg from June 16, 1864, to April 2, 1865.
