At 2 A.M. the flag-ship hoisted the appointed signal and the starboard column weighed, the heavy vessels taking a long while to purchase their anchors, owing to the force of the current. At 3.30 the Cayuga, leading, passed through the booms, the enemy waiting for the ships to come fairly into his power. In regular order followed the Pensacola, Mississippi, Oneida, Varuna, Katahdin, Kineo, Wissahickon, the Confederate fire beginning as the Pensacola passed through the breach. The Varuna, Cayuga, and Katahdin steamed rapidly on, the one heavy gun of the gunboats being ill-adapted to cope with those in the works; but the heavy ships, keeping line inside the gunboats, moved slowly by, fighting deliberately and stopping from time to time to deliver their broadsides with greater effect.
The Pensacola, following the Cayuga closely and keeping a little on her starboard quarter, stopped when near Fort St. Philip, pouring in her heavy broadside, before which the gunners of its barbette battery could not stand but fled to cover; then as the big ship moved slowly on, the enemy returned to their guns and again opened fire. The Pensacola again stopped, and again drove the cannoneers from their pieces, the crew of the ship and the gunners in the fort cursing each other back and forth in the close encounter. As the ship drew away and turned toward the mid-river, so that her guns no longer bore, the enemy manned theirs again and riddled her with a quartering fire as she moved off. At about this time the ram Manassas charged her, but, by a skilful movement of the helm, Lieutenant Roe, who was conning the Pensacola, avoided the thrust. The ram received the ship's starboard broadside and then continued down, running the gauntlet of the Union fleet, whose shot penetrated her sides as though they were pasteboard.
The Mississippi, following the Pensacola and disdaining to pass behind her guns, was reduced to a very low rate of speed. As she came up with and engaged Fort St. Philip, the Manassas charged at her, striking on the port side a little forward of the mizzen-mast, at the same time firing her one gun. The effect on the ship at the time was to list her about one degree and cause a jar like that of taking the ground, but the blow, glancing, only gave a wound seven feet long and four inches deep, cutting off the heads of fifty copper bolts as clean as though done in a machine. Soon after, moving slowly along the face of the fort, the current of the river caught the Mississippi on her starboard bow and carried her over to the Fort Jackson side.