...and threw up rifle-pits or breastworks, and retired, losing only one man killed. December 21.--Received orders at seven o'clock to cross the river, as Savannah was ours. Commenced recrossing to Argyle Island ; the One Hundred and Fiftieth crossed first, and then took position on the extreme south-easterly point of the island, to cover the crossing of the balance of the brigade. The rebels pressed our re...