Admiral Porter has proposed to place his boats in the position indicated to you a few days ago, and to bring over with them such troops as may be below the city after the guns of the enemy are silenced.

It may be that the enemy will occupy positions back from the city, out of range of the gunboats, so as to make it desirable to run past Grand Gulf and land at Rodney. In case this should prove the plan, a signal will be arranged and you duly informed, when the transports are to start with this view. Or, it may be expedient for the boats to run past, but not the men. In this case, then, the transports would have to be brought back to where the men could land and move by forced marches to below Grand Gulf, re-embark rapidly and proceed to the latter place. There will be required, then, three signals; one, to indicate that the transports can run down and debark the troops at Grand Gulf; one, that the transports can run by without the troops; and the last, that the transports can run by with the troops on board.