In accordance with this scheme, Colonel Thornton at nightfall moved his force down to the brink of the river, but no boats had arrived. Hour after hour elapsed, and then at last only a sufficient number to transport 350 men made their appearance. With this small force Colonel Thornton determined to make the attempt, and pushed off. The loss of time which had occurred was however fatal, for day began to break before the boats had crossed the river, and though the troops carried the batteries by assault, after a short but obstinate resistance, the alarm had already been carried to the main body of the enemy, and they were thoroughly prepared for defence.

The capture of the works on the right bank had, however, really made the front attack upon the American lines unnecessary; for the passage of the river now being clear, the armed boats from the canal could have passed up the stream and taken the whole of the position in rear. Had this been done, the American general would inevitably have been obliged to abandon his defences, falling back upon New Orleans, and we should have obtained possession of his formidable position without the loss of a man. Major-General Pakenham, however, still persevered in his original intention, and ordered the assault to take place.

There had been so much mismanagement, that the advance, which should have taken place at dawn, did not commence till some time after daylight. The officer, whose duty it was to have prepared fascines for the purpose of filling the ditches, had neglected his work; and, at 2 a.m., the hour at which he had been directed to have them ready, not one was made.[39] Eventually an insufficient number were got together, but "the 44th, which was appointed to carry them, had either misunderstood or neglected their orders, and now headed the column of attack, without any means being provided for crossing the enemy's ditch, or scaling his ramparts."

"The indignation of our brave leader on this occasion may be imagined, but cannot be described. Galloping towards Colonel Mullens, who led the 44th, he commanded him instantly to return for the fascines and ladders, but the opportunity of planting them was lost; and, though they were brought up, it was only to be scattered over the field by the frightened bearers, for our troops were by this time visible to the enemy. A dreadful fire was accordingly opened upon them, and they were mowed down by hundreds while they stood waiting for orders."

The word being given to advance, the other regiments rushed on to the assault. On reaching the first ditch a horrible scene of carnage ensued; the few fascines that were thrown down floated away; there were no ladders, and the men, crowding to the edge of the ditch in the hope of closing with the enemy, fell in heaps. Many threw themselves into the water, and endeavoured to struggle across, but were shot down, or drowned. On the right, Major-General Keane's column had, though reduced to half its strength, succeeded in passing the ditches near their junction with the marsh, and pushed on desperately to the palisade. But to scale this obstacle without ladders was no easy matter. Some few, indeed, by climbing upon their comrades' shoulders succeeded in entering the works, but only to be at once shot down; while those who remained outside were exposed to a flanking fire that swept them down by scores. The two West India regiments distinguished themselves by their desperate valour, so much so, indeed, as to win encomiums from the American general, Jackson.

On the left there had been a slight success, the 21st Regiment having stormed and taken a three-gun battery; but they were not supported, and the enemy, forcing their way into the work, retook it with great slaughter. In vain was the most obstinate courage displayed, the British were beaten off at all points.

"Sir Edward saw how things were going, and did all that a general could do to rally his broken troops. Riding towards the 44th, which had returned to the ground, but in great disorder, he called out to Colonel Mullens to advance; but that officer had disappeared, and was not to be found. He therefore prepared to lead them himself, and had put himself at their head for that purpose, when he received a slight wound in the knee from a musket-ball, which killed his horse. Mounting another, he again headed the 44th, when a second ball took effect more fatally, and he dropped lifeless into the arms of his aide-de-camp."

Major-Generals Keane and Gibb were, almost at the same moment, borne off the field severely wounded. "All was now confusion and dismay. Without leaders, ignorant of what was to be done, the troops first halted and then began to retire; till finally the retreat was changed into a flight, and they quitted the ground in the utmost disorder. But the retreat was covered in gallant style by the reserve. Making a forward motion, the 7th and 43rd presented the appearance of a renewed attack, by which the enemy were so much awed that they did not venture beyond their lines in pursuit of the fugitives."

The British loss in this action was over 1000 killed; while the Americans stated their total loss to be 8 killed and 14 wounded. The 1st West India Regiment had 5 rank and file killed, 2 sergeants and 16 rank and file wounded. The following officers were wounded: Captain Isles, Lieutenants McDonald and Morgan, Ensigns Miller and Pilkington; and all, with the exception of Ensign Miller, severely so. Lieutenants McKenzie and Dalomel, the only remaining officers of the regiment with the expedition, were publicly thanked by Major-General Lambert for the courage which they had displayed, and the able manner in which they had withdrawn the remnant of their corps from the enemy's palisades.