While all eyes were turned upon the siege works and every nerve strained for their completion, Logan's presence in the rear, though at no time so hurtful as might fairly have been expected, was a continual source of anxiety and annoyance. To find out just what force he had and what he was about, Grierson moved toward Clinton on the morning of the 3d of June with the 6th and 7th Illinois, the old 2d Massachusetts battalion, now merged in the 3d, a squadron of the 1st Louisiana, two companies of the 4th Wisconsin, mounted, and one section of Nims's battery. Grierson took the road by Jackson, and, when within three miles of that place, sent Godfrey, with 200 men of the Massachusetts and Louisiana cavalry, to ride through the town, while the main column went direct to Clinton. Godfrey pushing on briskly through Jackson, captured and paroled, after the useless fashion of the time, a number of prisoners, and rejoined the column two miles beyond. When eight miles west of Clinton, Grierson heard a report that Logan had gone that morning toward Port Hudson, but pushing on toward Clinton, after crossing the Comite Grierson found Logan's advance and drove it back on the main body, strongly posted on Pretty Creek. A three hours' engagement followed, resulting in Grierson's retirement to Port Hudson, with a loss of 8 killed, 28 wounded, and 15 missing; 3 of the dead and 7 of the wounded falling into the hands of the enemy. Logan reports his loss as 20 killed and wounded, and claims 40 prisoners. Among the killed, unfortunately, was the young cavalry officer, Lieutenant Solon A. Perkins, of the 3d Massachusetts, whose skill and daring had commended itself to the notice of Weitzel during the early operations in La Fourche, and whose long service without proper rank had drawn out the remark: "This Perkins is a splendid officer, and he deserves promotion as much as any officer I ever saw."

Banks determined to chastise Logan for this; accordingly, at daylight on the morning of the 5th of June, Paine took his old brigade under Fearing, with the 52d Massachusetts, the 91st New York, and two sections of Duryea's battery, and preceded by Grierson's cavalry, marched on Clinton by way of Olive Branch and the plank road. That night Paine encamped at Redwood creek; on the 6th he made a short march to the Comite, distant nine miles from his objective, and there halted till midnight. Then, after a night march, the whole force entered Clinton at daylight on the morning of the 7th, only to find that Logan, forewarned, had gone toward Jackson. Then Paine countermarched to the Comite, and, remaining till sunset, marched that evening to Redwood, and, there going into bivouac, at two o'clock on the following morning, the 8th of June, returned to the lines before Port Hudson. On this fruitless expedition the men and horses suffered severely from the heat, and there were many cases of sunstroke.

By the 1st of June the artillery and the sharp-shooters of the besieged had obtained so complete a mastery over the guns of the defenders, that on the whole line these were practically silent, if not silenced. In part, no doubt, this is to be ascribed to a desire on the part of the Confederate artillerists to reserve their ammunition for the emergency, yet something was also due to the effect of the Union fire, by which, in the first week, twelve heavy guns were disabled. The 10-inch columbiad in water battery 4 was dismounted at long range. This gun was known to the Union soldiers, and perhaps to the Confederates first, as the "Lady Davis," and great was the dread awakened by the deep bass roar and the wail of the big shells as they came rolling down the narrow pathway, or searched the ravines where the men lay massed. The fire of the navy also did great damage among the heavy batteries along the river front. When the siege batteries were nearly ready, on the evening of the 10th of June, Banks ordered a feigned attack at midnight by skirmishers along the whole front, for the purpose, as stated in the orders, "of harassing the enemy, of inducing him to bring forward and expose his artillery, acquiring a knowledge of the ground before the enemy's front, and of favoring the operations of pioneers who may be sent forward to remove obstructions if necessary." None of these objects can be said to have been accomplished, nor was any advantage gained beyond a slight advance of the lines, at a single point on Weitzel's front, by the 131st New York. The full loss in this night's reconnoissance is not known; in Weitzel's own brigade, there were 2 killed, 41 wounded, 6 missing—in all, 49; in Morgan's, a partial report accounts for 12 wounded and 59 missing, including two companies of the 22d Maine that became entangled and for the moment lost in the ravines.

On the evening of the 12th of June, all arrangements being nearly complete, Banks ordered a vigorous bombardment to be begun the next morning. Punctually at a quarter past eleven on the morning of the 13th, every gun and mortar of the army and navy that could be brought to bear upon the defences of Port Hudson opened fire, and for a full hour kept up a furious cannonade, limited only by the endurance of the Union guns and gunners, for the Confederates hardly ventured to reply, save at first feebly. When the bombardment was at its fiercest, more than one shell in a second could be seen to fall and explode within the narrow circuit of the defences visible from the headquarters on the field. The defenders had three heavy guns dismounted during the day, yet suffered little loss in men, for long before this nearly the whole garrison had accustomed themselves to take refuge in their caves and "gopher-holes" at the first sound of Union cannon, and to await its cessation as a signal to return to their posts at the parapet. They were not always so fortunate, however, for more than once it happened that three or four men were killed by the bursting of a single shell.

When the hour was up the cannonade ended as suddenly as it began, and profound silence followed close on the intolerable din. Then Banks sent a flag of truce summoning the garrison to surrender in these words: "Respect for the usages of war and a desire to avoid unnecessary sacrifice of life, impose on me the necessity of formally demanding the surrender of the garrison at Port Hudson. I am not unconscious, in making this demand, that the garrison is capable of continuing a vigorous and gallant defence. The events that have transpired during the pending investment exhibit in the commander and garrison a spirit of constancy and courage that, in a different cause, would be universally regarded as heroism. But I know the extremities to which they are reduced. . . . I desire to avoid unnecessary slaughter, and I therefore demand the immediate surrender of the garrison, subject to such conditions only as are imposed by the usages of civilized warfare." To this Gardner replied: "My duty requires me to defend this position, and therefore I decline to surrender."

In the evening the generals of division met in council at headquarters. In anticipation of what was to come, Dudley had already been ordered to send the 50th Massachusetts, and Charles J. Paine the 48th Massachusetts, to Dwight; and Dudley himself, with the 161st and 174th New York, was to report to Grover. This left under Augur's immediate command only five regiments of his division, namely, one, the 30th Massachusetts, of Dudley's brigade, and four of C. J. Paine's. Shortly before midnight a general assault was ordered for the following morning. At a quarter before three Augur was to open a heavy fire of artillery on his front, following it up half and hour later by a feigned attack of skirmishers. Dwight was to take two regiments, and, with a pair of suborned deserters for guides, was to try and find an entrance on the extreme left of the works near the river. But the main attack was to be made by Grover on the priest-cap. Its position is shown on the map at XV. and XVI., and the approach was to be from the cover of the winding ravine, near the second position of Duryea's battery, at No. 12. The artillery cross-fire at this point was to begin at three o'clock, and was to cease at a signal from Grover. At half-past three the skirmishers were to attack. The general formation of each of the two columns of attack had been settled in orders issued from headquarters on the morning of the 11th. Each column, assumed to consist of about 2,000 men, was to be preceded and covered by 300 skirmishers; immediately behind the skirmishers were to be seventy pioneers, carrying thirty-five axes, eighteen shovels, ten pickaxes, two handsaws, and two hatchets; next was to come the forlorn hope, or storming party, of 300 men, each carrying a bag stuffed with cotton; following the stormers, thirty-four men were to carry the balks and chesses to form a bridge over the ditch, in order to facilitate the passage of the artillery, as well as of the men. The main assaulting column was to follow, marching in lines-of-battle, as far as the nature of the ground would permit, which, as it happened, was not far. The field-artillery was to go with the assaulting column, each battery having its own pioneers. To the cavalry, meanwhile, was assigned the work of picketing and protecting the rear, as well as of holding the telegraph road leading out of Port Hudson toward Bayou Sara, by which it was thought the garrison might attempt to escape, on finding their lines broken through, or even to avoid the blow.

As was the uniform custom during the siege, all watches at division and brigade headquarters were set at nine o'clock, by a telegraphic signal, to agree with the adjutant-general's watch.

These final orders for the assault bear the hour of 11.30 P.M. This was in fact the moment at which the earliest copies were sent out by the aides-de-camp, held in readiness to carry them. There were seven hundred and fifty words to be written, and eleven o'clock had already passed when the council listened to the reading of the drafts and broke up. From the lateness of the hour, as well as from the distance and the darkness of the night, it resulted that one o'clock came before the last orders were in the hands of the troops that were to execute them. Many arrangements had still to be carried out and many of the detachments had still to be moved over long distances and by obscure ways to the positions assigned to them. In some instances all that was left of the night was thus occupied, and it was broad daylight before every thing was ready.

A dense fog prevailed in the early morning of Sunday, the 14th of June, strangely veiling, while it lasted, even the sound of the big guns, so that in places it was unheard a hundred yards in the rear. Punctually at the hour fixed the cannonade opened. It was an hour later, that is to say, about four o'clock, when the first attack was launched.

For the chief assault Grover had selected Paine's division and had placed the main body of his own division with Weitzel's brigade, in close support. Paine determined to lead the attack himself. Across his front as skirmishers he deployed the 4th Wisconsin, now again dismounted, and the 8th New Hampshire. The 4th Massachusetts was told off to follow the skirmishers with improvised hand-grenades made of 6-pounder shells. Next the 38th Massachusetts and the 53d Massachusetts were formed into line of battle. At the head of the infantry column the 31st Massachusetts, likewise deployed, carried cotton bags, to fill the ditch. The rest of Gooding's brigade followed, next came Fearing's, then Ingraham's under Ferris. In rear of the column was posted the artillery under Nims. At a point on the crest of the ridge, ninety yards distant from the left face of the priest-cap, Paine's advance was checked. Then Paine, who had previously gone along the front of every regiment, addressing to each a few words of encouragement and of preparation for the work, passed afoot from the head of the column to the front of the skirmish line, and exerting to the full his sonorous voice, gave the order to the column to go in. At the word the men sprang forward, but almost as they did so, the Confederates behind the parapet in their front, with fairly level aim and at point-blank range, poured upon the head of the column a deadly volley. Many fell at this first discharge; among them, unfortunately, the gallant Paine himself, his thigh crushed by a rifle-ball. Some of the men of the 4th Wisconsin, of the 8th New Hampshire, and of the 38th Massachusetts gained the ditch, and a few even climbed the parapet, but of these nearly all were made prisoners. The rear of the column fell back to the cover of the hill, while all those who had gained the crest were forced to lie there, exposed to a pitiless fire of sharp-shooters and the scarcely more endurable rays of the burning sun of Louisiana, until night came and brought relief. In this unfortunate situation the sufferings of the wounded became so unbearable, and appealed so powerfully to the sympathy of their comrades, that many lives were risked and some lost in the attempt to alleviate the thirst, at least, of these unfortunates. Two men, quite of their own accord, took a stretcher and tried to reach the point where Paine lay, but the attempt was unsuccessful, and cost both of them their lives. These heroes were E. P. Woods, of Company E of the 8th New Hampshire, and John Williams, of Company D, 31st Massachusetts. Not less nobly, Patrick H. Cohen, a private soldier of the 133d New York, himself lying wounded on the crest, cut a canteen from the body of a dead comrade and by lengthening the strap succeeded in tossing it within reach of his commander; this probably preserved Paine's life, for unquestionably many of the more seriously hurt perished from the heat and from thirst on that fatal day.