...anced. Gens. Sumner and Couch soon came to a conclusion that these batteries must be at once silenced, so that we might have free access along the river road. The Fifty-seventh New-York, Licut.- Col. Chapman commanding, and the Fifty-third Pennsylvania, Col. Brooks, advanced as skirmishers along the Falmouth road, until within a mile of the town. These two regiments were followed by the remainder of th...