“SIR: I had the honor to inform you from Alexandria of the capture of that place, and the forts defending the approaches to the city, by the naval forces under my command. Twenty-four hours after we arrived the advance guard of United States troops came into the city. General Banks arriving soon after, I turned the place over to his keeping. The water beginning to fall, I deemed it prudent to return with the largest vessels to the mouth of the Red river. I dropped down to Fort de Russe in the Benton, and undertook to destroy these works. I only succeeded however, in destroying the three heavy casemates commanding the channel and a small water battery for two guns. About six hundred yards below it I destroyed by bursting one heavy thirty-two pounder and some gun carriages left in their hurry by the enemy. “The main fort, on a hill some nine hundred yards from the water, I was unable to attend to. It is quite an extensive work, new and incomplete, but built with much labor and pains. It will take two or three vessels to pull it to pieces. I have not the powder to spare to blow it up. The vessels will be ordered to work on it occasionally, and it will be soon destroyed. In this last-mentioned fort was mounted the 11-inch gun, which I am led to believe lies in the middle of the river, near the fort, the rebels throwing it overboard in their panic at the approach of our gunboats. The raft which closed the entrance I have blown up, sawed in two, and presented to the poor of the neighborhood. I sent Commander Woodworth in the Price, with the Switzerland, Pittsburg, and Arizona, up Black river to make a reconnoissance, and he destroyed a large amount of stores, valued at three hundred thousand dollars, consisting of salt, sugar, rum, molasses, tobacco, and bacon. (Signed) DAVID D. PORTER, Acting Rear-Admiral, Commanding Mississippi Squadron. General Banks now concentrated his troops at Simmesport, preparatory to an advance on Port Hudson. Minor expeditions were meanwhile taking place in other districts of the department. A brigade under General Nickerson advanced to the neighborhood of Lake Pontchartrain, destroying some valuable property, and capturing a few prisoners. A portion of General Auger’s division penetrated to a point on the railroad between Clinton and Port Hudson, where they encountered and routed a Confederate force, killing five and capturing twenty-five. Colonel Grierson was also successful in an expedition near Port Hudson, capturing three hundred head of cattle. Admiral Farragut now in command of the fleet, was preparing to assist in the attack on Port Hudson. General Banks’s army advanced about the middle of May from Baton Rouge to Port Hudson, portions of his army on either bank of the Mississippi, and a part being forwarded on transports.