Meanwhile, Sherman, having none but military duties to embarrass him, was in Vicksburg on the 6th, and at once issued his orders to General A.J. Smith, who was to command the corps detached up the Red river. On the 11th Smith was at the mouth of the River, where he met Porter, who had been there since the 2d, and had with him the following vessels: Essex, Commander Robert Townsend; Eastport, Lieutenant-Commander S.L. Phelps; Black Hawk, Lieutenant-Commander K.R. Breese; Lafayette, Lieutenant-Commander J.P. Foster; Benton, Lieutenant-Commander J.A. Greer; Louisville, Lieutenant-Commander E.K. Owen; Carondelet, Lieutenant-Commander J.G. Mitchell; Osage, Lieutenant-Commander T.O. Selfridge; Ouachita, Lieutenant-Commander Byron Wilson; Lexington, Lieutenant G.M. Bache; Chillicothe, Lieutenant S.P. Couthouy; Pittsburg, Lieutenant W.B. Hoel; Mound City, Lieutenant A.R. Langthorne; Neosho, Lieutenant Samuel Howard; Ozark, Lieutenant G.W. Browne; Fort Hindman, Lieutenant John Pearce; Cricket, Master H.H. Gorringe; Gazelle, Master Charles Thatcher. Most of these vessels will be recognized as old acquaintances. The last three were light-draughts, the Cricket and Gazelle being but little over 200 tons. The Ouachita was a paddle-wheel steamer, carrying in broadside, on two docks, a numerous battery of howitzers, eighteen 24-pounders and sixteen 12-pounders (one of the latter being rifled); and besides these, five 30-pounder rifles as bow and stern guns. The Ozark, Osage, and Neosho, were ironclads of very light draught, having a single turret clad with 6-inch armor in which were mounted two XI-inch guns. They were moved by stern paddle-wheels covered with an iron house, of 3/4-inch plates, which was higher than the turret, and from a broadside view looked like a gigantic beehive. The Essex did not go farther than the mouth of the river. Early on the morning of March 12th the gunboats started up, the transports following. There was just enough water to allow the larger boats to pass. The transports, with the Benton, Pittsburg, Louisville, Mound City, Carondelet, Chillicothe, Ouachita, Lexington, and Gazelle turned off into the Atchafalaya, the admiral accompanying this part of his squadron; while Lieutenant-Commander Phelps with the other vessels continued up the Red River to remove obstructions, which the enemy had planted across the stream eight miles below Fort de Russy. The army landed at Simmesport on the 13th, taking possession there of the camping-ground of the enemy, who retreated on Fort de Russy. The next day at daylight they were pursued, and Smith's corps, after a march of twenty-eight miles, in which it was delayed two hours to build a bridge, reached the fort in time to assault and take it before sundown. The Confederate General Walker had withdrawn the main body of his troops, leaving only 300 men, who could offer but slight resistance. Eight heavy guns and two field-pieces were taken.