General Grant having now fully determined to transport his army below Vicksburg, the cooperation of the naval commander was obtained: and on the 16th of April, three transports, under cover of the gunboats, were in readiness to descend the river. At half-past ten at night Admiral Porter’s vessels started on their perilous expedition down the river. The vessels comprising the expedition started in the following order, fifty yards apart: Benton, Lieutenant-Commander Green; Lafayette, Captain Walker, with the General Price lashed on the starboard side; Louisville, Lieutenant-Commander Owen; Mound City, Lieutenant Wilson; Pittsburg, Lieutenant Hall; Carondolet, Lieutenant Murphy, and Tuscumbia, Lieutenant Commander Shirk, with the tug Day, which was lashed to the Benton. The three army transports were in the rear of these vessels, and the Tuscumbia was placed astern of all. Two of the transports, when the firing became heavy, attempted to run up stream; but Lieutenant Commander Shirk drove them back, and stayed behind them until the Forest Queen was disabled. He then took her in tow, and placed her out of reach of the enemy’s shot. All the vessels except the Benton took coal barges in tow, and all except the Lafayette brought them safely past the batteries. Having the Price alongside the Lafayette did not manage very well, and the coal barge got adrift, but was picked up at New Carthage. The Louisville, Lieutenant Commander Owen, lost hers in the melee, but picked it up again. The Benton fired over eighty shell, well directed, into the town and batteries. The Pittsburg, Mound City and Tuscumbia were more fortunate than the others in not turning round as they came by, although no ill results happened to those vessels which did turn. The pilots were deceived by a large fire started on the side opposite to Vicksburg by the rebels, for the purpose of showing the vessel more plainly. Fires being started on both sides of the river at once, the vessels had some narrow escapes, but were saved in most instances, by the precautions taken to protect them. They were covered with heavy logs and bales of wet hay, which was found to be an excellent defence. No one on board of the transports was injured; and, encouraged by the success of this enterprise, General Grant ordered six more to be prepared in like manner for running the batteries. On the night of the 22d of April the Tigress, Anglo Saxon, Cheeseman, Empire City, Horizona and Moderator, left Milliken’s Bend, and all passed in safety but the Tigress, which received a shot in her hull below water-line, and sunk on the Louisiana shore. CAPTURE OF GRAND GULF, MISS. APRIL 29-MAY 3, 1863.