On the 6th, General Pope telegraphed that Colonel Plummer had not yet been able to effect his lodgement at Point Pleasant, but that the sharpshooters were trying to drive the artillerymen of the gunboats from their pieces. Next day, the 7th, General Halleck telegraphed to Pope: "After securing the roads so as to prevent the enemy's advance north, you will withdraw your remaining forces to Sikeston, and thence to Bird's Point or Commerce for embarkation. They will proceed up the Tennessee to reinforce General C. F. Smith. Good luck." On the same day, the 7th, General Pope reported by telegraph Plummer's success in establishing himself, and nothing more was heard about abandoning the expedition.

General Pope had asked for rifled thirty-twos. General Cullum, Halleck's chief of staff, who was stationed at Cairo and had immediate charge and supervision of sending reinforcements and supplies to the armies in Halleck's department, not finding rifled thirty-twos, obtained three twenty-four-pounders and one eight-inch howitzer. Colonel Bissell, of the engineer regiment, who was in Cairo waiting for them, received these four pieces on March 11th. They were shipped across the river to Bird's Point, and sent by rail to Sikeston. At Sikeston a detachment from the company of regular artillery, with horses, as well as the regiment of engineers, were waiting. The pieces were quickly unshipped and mounted on carriages. The engineers had such success in repairing the road, and the artillery in conducting the pieces, that all arrived in good order about sunset of the 12th.

Major Lathrop, commanding the artillery, had, on the 11th, reconnoitered the ground and selected a position about eight hundred yards in front of Fort Thompson, for batteries to contain the siege-guns. On Colonel Bissell's arrival, he went again to the front and pointed out the position selected. About dusk, two companies of the Thirty-ninth Ohio, deployed as skirmishers, drove back the enemy's pickets toward the works. At nine o'clock P.M., Colonel Bissell and Major Lathrop arrived on the ground with Colonel Morgan, who had with him the Tenth and six companies of the Sixteenth Illinois. The Tenth Illinois, advancing in open order, pushed the enemy's pickets still farther back and close to their works. The six companies of the Sixteenth followed with picks and spades. Two companies of the Tenth, deployed as skirmishers, were pushed forward, covering the front and flanks of the party, with orders not to fire even if fired upon. The remaining eight companies of the Tenth Illinois joined the Sixteenth as a working party. The lines of two batteries for two guns each, and lines of infantry intrenchments, had now been traced. The fourteen companies worked with such zeal that the works were completed by three o'clock A.M. Captain Mower, of the First United States Infantry, who, with Companies A and H of his regiment, had been put in command of the siege-artillery, put the four pieces in position; Colonel Morgan, recalling his pickets, posted his command in the trenches. General Stanley moved out with his division in support, and, at daylight, Mower opened fire upon Fort Thompson.

The force in Forts Thompson and Bankhead numbered about three thousand effectives, according to General A.P. Stewart, who had general command of both; thirty-five hundred, according to General Gantt, who commanded at Fort Thompson, and had been promoted after being assigned to the command. The fire from Captain Mower's guns was the first notice General Gantt or his men had of the erection of the batteries. Fort Thompson replied with all its guns. Fort Bankhead joined with its heavy ordnance and field-battery. Commodore Hollins brought his fleet close in shore and aided the bombardment. Captain Mower, by direction of General Pope, paid little heed to the forts, but directed most of his fire to the boats. The forts on either side were little injured. One twenty-four pounder in Mower's battery, and one thirty-two in Fort Thompson, were disabled. The gunboats were struck, but not seriously injured.

In the evening, General McCown visited Commodore Hollins on his flag-ship, and, after a conference, sent for General Stewart. Commodore Hollins stated that he had been positively assured that heavy artillery could not be brought over the wet and swampy country, and he was not prepared to encounter it. General McCown said it was evident to him that Pope intended, by regular approaches, to cut off Fort Thompson. He told A.P. Stewart that reinforcements could not be expected within ten days. Stewart said he could not hold out three days. All agreed, then, that the forts must be evacuated, and immediately.

About ten o'clock P.M. a gunboat and two transports reported to Colonel Walker at Fort Bankhead, and General Stewart proceeded with two gunboats to Fort Thompson.

According to Colonel Walker's report, the evacuation and embarkation at his post was orderly, though impeded by a heavy rain-storm, and restricted by the very insufficient transportation afforded by the boats. He was unable to carry off any of the heavy guns, but succeeded in shipping the guns of Bankhead's field-battery, leaving their limbers and caissons behind. General Gantt's report represents a like state of affairs at Fort Thompson. But, according to General Stewart's report, his directions were imperfectly carried out. One twenty-four pounder was pulled off its platform into the swamp in its rear, where it sank so deep in the mud that it was impossible to move it. No attempt was made to remove more. The storm began at eleven o'clock. "The rain was unusually violent, and the night became so dark that it was difficult to see, except by the flashes of lightning. The men became sullen and indifferent—indisposed to work. I spent some time in collecting together such of them as were idle and urged them to carry off the boxes of ammunition from the magazine, and pass them aboard the boat. At length I learned from Captain Stewart that all the guns had been spiked, that rat-tail files had been sent up for the purpose from one of the gunboats, with orders to spike the guns. I replied that no such orders had been given by me, that the spiking of the guns should have been the last thing done." "Soon after this an artillery officer informed me that Gantt's regiment was going aboard the boats, that Captain Carter was hurrying them, telling them he intended to save his boats, and would leave them to shift for themselves if the enemy fired." "I directed the artillery officers, before the boats left, to make an effort to get their tents on board. They subsequently reported that they could not get many of the men together in the darkness and rain, nor induce the few whom they did collect to do anything at it." General Stewart ordered the pickets who had been sent out to cover the movement to be recalled, and the tents and quarters to be searched. Thirteen men, however, were left. One of the gunboats took in tow a wharf-boat at the landing, which was used as a hospital and contained several hundred sick. Between three and four o'clock in the morning the boats pulled out and left.

Morgan's brigade, after constructing the works in the night of the 12th, remained in the trenches till relieved early in the morning of the 14th. At two o'clock A.M. of the 14th, General Hamilton advanced with his division to relieve General Stanley in support, and with Slack's brigade of Palmer's division to relieve Morgan's brigade in the trenches. "The darkness was palpable, the rain poured down in torrents, the men were obliged to wade through pools knee-deep. Silence having been strictly enjoined, the division, hoping to have the honor of leading in the assault on the enemy's works, moved steadily forward with cheerful alacrity; those assigned to that duty taking post in the rifle-pits half full of water, without a murmur." A heavy fog obscured the dawn. About six o'clock two deserters reported that the fort had been hastily abandoned in the night, after a portion of the guns had been spiked. Captain Mower and Lieutenant Fletcher, commanding the two companies in charge of the siege-guns, were dispatched into the fort to hoist the American flag. Two field-batteries, besides the heavy artillery, great quantities of ammunition for small arms as well as for the artillery, tents, stores of all sorts, the wagons, horses, and mules of the troops at Fort Thompson, were found. The wagons and animals at Fort Bankhead had been sent across the river a few days before. General Beauregard, whose command included these defences, ordered an inquiry into the facts of the evacuation of New Madrid. The inspecting officer reported substantially in accordance with the report of General A.P. Stewart.

Immediately the evacuation was confirmed, Hamilton's division was moved into the works and their guns were turned toward the river. Without delay, batteries were at night sunk at points along the river just back of the river-bank, and the captured siege-guns, hauled laboriously by hand down the the strip of more solid ground between the river and swamp, were placed in position in them. The lowest battery was below Point Pleasant, and opposite and a little below Tiptonville. This extended General Pope's line seventeen miles along the river. The lowest battery commanded the lowest solid ground on the Tennessee shore—all below was swamp. This battery, if maintained, cut off the enemy alike from retreat, and from reinforcements and supplies. When the morning of the 15th disclosed the muzzles of the heavy guns peering over the river-bank as over a parapet, five gunboats moved up within three hundred yards, and with furious cannonade strove to destroy them. In an hour and a half one gunboat was sunk, others damaged, gunners on them shot from the rifle-pits on shore, and the fleet retired.

On March 15th, Commodore Foote moved with his fleet of gunboats and mortar-boats to the neighborhood of Island No. 10, and next day engaged the batteries on the island and the main-land, at long range, to ascertain their position and armament. Next day five gunboats and four mortar-boats moved down to within two thousand yards of the upper battery or redan, and opened fire. The batteries on main-land and island replied. One hundred pieces of heavy ordnance rent the quivering air with their thunder. The rampart of the redan had been constructed twenty-four feet thick, but the high water beating against it had washed it, and, by percolation, softened it. The heavy shot from the gunboats passed though it. Thirteen-inch shells exploding in the ground made caverns in the soil. Water stood on the ground within, and the artillerists waded in mud and water. The conflict lasted till evening. The staff of the signal-flag used in the redan was shattered by a shot; but the officer, Lieutenant Jones, picking up the flag, and using his arm as a staff, continued signalling. The rampart of the redan was torn and ridged, and one sixty-four gun was dismounted and another injured, an officer killed, and seven enlisted men wounded. On the island a one hundred and twenty-eight pound gun burst. In the fleet a gun burst on the Pittsburg, killing and wounding fourteen men.