Arnold was ordered to bring up the siege train, manned by the 1st Indiana heavy artillery, and Houston to provide entrenching tools and siege materials. When all the siege artillery was in position there were forty pieces, of which six were 8-inch sea-coast howitzers on siege carriages, eight 24-pounders, seven 30-pounder Parrotts, four 6-inch rifles, four 9-inch Dahlgren guns, four 8-inch mortars, three 10-inch mortars, and four 13-inch mortars. To these were added twelve light batteries of sixty pieces, namely, six 6-pounder Sawyer rifles, two 10-pounder Parrotts, twenty-six 12-pounder Napoleons, two 12-pounder howitzers, twelve 3-inch rifles, and twelve 20-pounder Parrotts. The Dahlgren guns were served by a detachment of fifty-one men from the _Richmond_ and seventeen from the _Essex_, under Lieutenant-Commander Edward Terry, with Ensign Robert P. Swann, Ensign E. M. Shepard, and Master's Mates William R. Cox and Edmund L. Bourne for chiefs of the gun divisions.
In the course of the next few days the eight regiments that had been left on the Teche and the Atchafalaya rejoined the army before Port Hudson, coming by way of Brashear, Algiers, and the river. This gave to the cavalry under Grierson one more regiment, the 41st Massachusetts, now mounted, and henceforth known as the 3d Massachusetts cavalry, the three troops of the old 2d battalion being merged in it; Weitzel got back the 114th New York; Paine recovered the 4th Massachusetts and the 16th New Hampshire of Ingraham's brigade, now practically broken up; and Grover the 22d Maine and 90th New York of Dwight's brigade, the 52d Massachusetts of Kimball's, and the 26th Maine of Birge's, while losing the 41st Massachusetts by its conversion into a mounted regiment. The 16th New Hampshire, however, had suffered so severely during its six week's confinement in the heart of the pestilential swamp that it was reduced to a mere skeleton, without strength either numerical or physical. It was easy to see that officers and men alike were suffering from some aggravated form of hepatic disorder, due to malarial poison. Many were added to the sick-report every day. Few that went to the regimental or general hospital returned to duty, while of the men called well all were yellow, emaciated, and restless, or so drowsy that the sentries were found asleep on their posts at noonday. This unfortunate regiment was therefore taken from the front and set to guard the general ammunition depot, near headquarters. Without being once engaged in battle, so that it had not a single gunshot wound to report, the 16th New Hampshire suffered a loss by disease during its seven months' service in Louisiana of 5 officers and 216 men--in all, 221; and nearly the whole of this occurred in the last two months. This regiment was replaced in Paine's division by the 28th Connecticut, from Pensacola.