While Farragut was putting his fleet in thorough order for this adventure, looking after all needful arrangements with minute personal care, Banks concentrated all his disposable force at Baton Rouge. By the 7th of March, leaving T. W. Sherman to cover New Orleans and Weitzel to hold strongly La Fourche, Banks had a marching column, composed of Augur's, Emory's, and Grover's divisions, 15,000 strong. On the 9th of March tents were struck, to be pitched no more for five hard months, and the next morning the troops were ready, but repairs delayed the fleet, the last vessels of which did not reach Baton Rouge until about the 12th. On that day, for the first time, Banks reviewed his army, on the old battle-ground, in the presence of the admiral, his staff, and many officers of the fleet. The new regiments, with some exceptions, showed plainly the progress already attained under the energetic training and constant work of their officers. The degree of instruction and care then apparent forecast the value of their actual service. The 38th Massachusetts and 116th New York were specially commended in orders.
To hold Baton Rouge about 3,000 men were detached, under Chickering, including the 41st Massachusetts, 173d New York, 175th New York, 1st Indiana heavy artillery, 3d Louisiana native guards, Mack's battery, and Troop F of the Rhode Island cavalry.
All arrangements being concerted for the passage of the batteries on the evening of the 14th of March, Grover set out on the afternoon of the 13th, followed, at daybreak the next morning, by Emory, with Augur bringing up the rear. In the afternoon Grover went into camp, covering the intersection of the Bayou Sara road and the road that leads from it toward the river. Emory formed on his left, covering the branches of this road that lead to Springfield Landing and to Ross Landing, his main body supporting the centre at Alexander's plantation. Augur, on the right, held the cross-road that leads from the Bayou Sara road by Alexander's to the Clinton road at Vallandigham's. At two o'clock in the afternoon the signal officers opened communication from Springfield Landing with the fleet at anchor near the head of Prophet Island, and a strong detachment was posted near the landing to maintain the connection.
As the Confederates were known to have a force of about 1,200 cavalry somewhere between Clinton and Baton Rouge, strong detachments became necessary to observe all the approaches and to hold the roads and bridges in the rear in order to secure the withdrawal of the army when the demonstration should be completed, as well as to guard the operation from being inopportunely interrupted. These dispositions reduced the force for battle to about 12,000.
It had been intended to concentrate nearly all the artillery near the river in the vicinity of Ross Landing in such a manner as to engage, or at least divide, the attention of the lower batteries of Port Hudson; but the maps were even more imperfect than usual, and when a reconnoissance, naturally retarded by the enemy's advance guard, showed that the road by which the guns were to have gone into position did not exist, the daylight was already waning. A broken bridge also caused some delay.
At five o'clock in the afternoon Banks received a despatch from Farragut announcing an important change in the hour fixed for the movement of the fleet. Instead of making the attempt "in the gray of the morning," as had been the admiral's first plan, he now meant to get under way at eight o'clock in the evening. When darkness fell, therefore, it found the troops substantially in the positions already described, yet with their outposts well thrown forward.
About ten o'clock the fleet weighed anchor and moved up the river. The flagship Hartford took the lead, with the Albatross lashed to her port side, next the Richmond with the Genesee, the Monongahela with the Kineo, and last the side-wheeler Mississippi alone. The Essex and Sachem remained at anchor below, with the mortar boats, to cover the advance. An hour later a rocket shot up from the bluff and instantly the Confederate batteries opened fire. They were soon joined by long lines of sharpshooters. To avoid the shoal that makes out widely from the western bank, as well as to escape the worst of the enemy's fire, both of musketry and artillery, the ships hugged closely the eastern bluff; so closely, indeed, that the yards brushed the leaves from the overhanging trees and the voices of men on shore could be distinctly heard by those on board. Watch-fires were lighted by the Confederates to show as well the ships as the range; yet this did more harm than good, since the smoke united with that of the guns ashore and afloat to render the fleet invisible. On the other hand, the pilots were soon unable to see.
The Hartford, meeting the swift eddy at the bend, where the current describes nearly a right angle, narrowly escaped being driven ashore. The Richmond, following, was disabled by a shot through her engine-room when abreast of the upper battery at the turn. The Monongahela's consort, the Kineo, lost the use of her rudder, and the Monongahela herself ran aground on the spit; presently the Kineo, drifting clear, also grounded, but was soon afloat again, and, with her assistance, the Monongahela too swung free, after nearly a half hour of imminent peril. Then the Kineo, cast loose by her consort, drifted helplessly down the stream, while the Monongahela passed up until a heated bearing brought her engines to a stop and she too drifted with the current.
Last of the fleet, the Mississippi, unseen in the smoke, and therefore safe enough from the Confederate guns, yet equally unable to see either friend, foe, or landmark, was carried by the current hard on the spit; then, after a half hour of ineffectual exertion, lying alone and helpless under the concentrated aim of the Confederate batteries, she was abandoned and set on fire by her captain. About three in the morning, becoming lighter, as the fire did its work, she floated free and drifted down the stream one mass of flames, in plain view, not merely of the fleet, but also of the army, condemned to stand to arms in sight and sound of the distant battle and now to look on idly as, with a mighty flash and roar, the Mississippi cast to the heavens her blazing timbers, amid a myriad of bursting shells, in one mountain of flame: then black silence.
Thus, when at last the gray of the morning came, the Hartford and Albatross rode in safety above Port Hudson, while the Richmond, Monongahela, Genesee, and Kineo, all battered and more or less injured, lay at anchor once more near Prophet Island, and the Mississippi had perished in a blaze of glory.