 Also on 28 January, the 810th Battalion, 4th Regiment and the 2nd Sapper Battalion began marching toward the city from locations along the coast east of Huế.On the afternoon of 29 January, the main body of the southern wing, the 804th Battalion, the 1st Sapper Battalion, the 815th and 818th Battalions of the 5th Regiment, the southern wing command group, and various supporting units descended from their mountain staging area and headed for the Tả Trạch River, which stood between the attacking force and Huế.The units intended to use a ferry station south of the city to cross the river.