At three o'clock on the morning of the 13th of January the crossing of Berwick Bay began; by half-past ten the gunboats had completed the ferriage of the cavalry and artillery; the infantry following landed at Pattersonville; then the whole force formed in line and, moving forward in the afternoon to the junction of the Teche with the Atchafalaya, went into bivouac. The next morning began the ascent of the Teche. The 8th Vermont was thrown over to the east or left bank of the bayou, while the main line moved forward on the west bank to attack the _Cotton_, now in plain sight. The gunboats led the movement, necessarily in line ahead, owing to the narrowness of the bayou. On either bank Weitzel's line of battle, with skirmishers thrown well forward, was preceded by sixty volunteers from the 8th Vermont and the same number from the 75th New York, whose orders were to move directly up to the _Cotton_ and pick off her gunners. The line of battle moved forward steadily with the column of gunboats. Between the Union gunboats and the _Cotton_ the bayou had been obstructed so as to prevent any hostile vessel from ascending the stream beyond that point. A brisk fight followed. Under cover of the guns of the navy and of the raking and broadside fire of the batteries, the 8th Vermont and 75th New York first drove off the land supports and then moving swiftly on the _Cotton_ silenced her. In this advance the Vermonters captured one lieutenant and forty-one men. The _Cotton_ retreated out of range. That night her crew applied the match and let her swing across the bayou to serve as an additional obstruction. In a few moments she was completely destroyed.
Then, having thus easily gained his object, Weitzel returned to La Fourche. His losses in the movement were 1 officer and 5 men killed, and 2 officers and 25 men wounded. Lieutenant James E. Whiteside, of the 75th New York, who had volunteered to lead the sharpshooters on the right bank, was killed close to the _Cotton_, in the act of ordering the crew to haul down her flag. Among the killed, also, was the gallant Buchanan--a serious loss, not less to the army than to the navy.
During a lull in the naval operations above Vicksburg, occasioned by the want of coal, eleven steamboats that had been in use by the Confederates on the Mississippi between Vicksburg and Port Hudson, took advantage of Porter's absence to slip up the Yazoo for supplies. There Porter's return caught them as in a trap.