The end of June was now drawing near, and already the losses of the besiegers in the month of constant fighting exceeded 4,000. At least as many more were sick in the hospitals, while the reinforcements from every quarter barely numbered 3,000. There were no longer any reserves to draw from; the last man was up. The effective strength of all arms had at no time exceeded 17,000.(1) Of these less than 12,000 can be regarded as available for any duty directly connected with the siege, and now every day saw the command growing smaller in numbers, as the men fell under the fire of the sharp-shooter, or succumbed to the deadly climate, or gave out exhausted by incessant labor and privation. The heat became almost insupportable, even to those who from time to time found themselves so fortunate as to be able to snatch a few hours' rest in the dense shade of the splendid forest, until their tour of duty should come again in the trenches, where, under the June sun beating upon and baking all three surfaces, the parched clay became like a reverberating furnace. The still air was stifling, but the steam from the almost tropical showers was far worse. Merely in attempting to traverse a few yards of this burning zone many of the strongest men were sunstruck daily. The labor of the siege, extending over so wide a front, pressed so severely upon the numbers of the besieging army, always far too weak for such an undertaking in any climate at any season, above all in Louisiana in June, that the men were almost incessantly on duty, either in digging, as guards of the trenches, as sharp-shooters, or on outpost service; and as the number available for duty grew smaller, and the physical strength of all that remained in the ranks daily wasted, the work fell the more heavily. When the end came at last the effective force, outside of the cavalry, hardly exceeded 8,000, while even of this small number nearly every officer and man might well have gone on the sick-report had not pride and duty held him to his post.

This will seem the less remarkable when it is remembered that the garrison during the same period suffered in the same proportion, while from like causes less than a year before Breckinridge had, in a much shorter time, lost the use of half his division. Butler's experience had been nearly as severe.

To the suffering and labors that are inseparable from any operation in the nature of a siege were added insupportable torments, the least of which were vermin. As the summer days drew out and the heat grew more intense, the brooks dried up; the creek lost itself in the pestilential swamp; the wells and springs gave out; the river fell, exposing to the almost tropical sun a wide margin of festering ooze. The mortality and the sickness were enormous.

The animals suffered in their turn, the battery horses from want of exercise, the train horses and mules from over-work, and all from the excessive heat and insufficiency of proper forage. There was never enough hay; the deficiency was partly eked out by making fodder of the standing corn, but this resource was quickly exhausted, and after the 3d of July, when Taylor sealed the river by planting his guns below Donaldsonville, all the animals went upon half or quarter rations of grain, with little hay or none. At length, for two or three days, the forage depots fairly gave out; the poor beasts were literally starving when the place fell, nor was it for nearly a week after that event that, by the raising of Taylor's blockade below and the arrival of supplies from Grant above, the stress was wholly relieved.

The two colored regiments, the 1st and 3d Louisiana Native Guards, besides strongly picketing their front, were mainly occupied, after the 27th of May, in fatigue duty in the trenches on the right. While the army was in the Teche country, Brigadier-General Daniel Ullmann had arrived at New Orleans from New York, bringing with him authority to raise a brigade of colored troops. With him came a full complement of officers. A few days later, on the 1st of May, Banks issued, at Opelousas, an order, which he had for some time held in contemplation, for organizing a corps of eighteen regiments of colored infantry, to consist, at first, of five hundred men each. These troops were to form a distinct command, to which he gave the name of the Corps d'Afrique, and in it he incorporated Ullmann's brigade. By the end of May Ullmann had enrolled about 1,400 men for five regiments, the 6th, 7th, 8th, 9th, and 10th. These recruits, as yet unarmed and undrilled, were now brought to Port Hudson, organized, and set to work in the trenches and upon the various siege operations.

About the same time the formation of a regiment of engineer troops was undertaken, composed of picked men of color, formed in three battalions of four companies each, under white officers carefully chosen from among the veterans. The ranks of this regiment, known as the 1st Louisiana engineers, were soon recruited to above a thousand; the strength for duty was about eight hundred. Under the skilful handling of Colonel Justin Hodge it rendered valuable service throughout the siege.

Company K of the 42d Massachusetts, commanded by Lieutenant Henry A. Harding, had for some months been serving as pontoniers, in charge of the bridge train. During the siege it did good and hard work in all branches of field engineering under the immediate direction of the Chief Engineer.

While at Opelousas, Banks had applied to Halleck to order Brigadier-General Charles P. Stone to duty in the Department of the Gulf. Stone had been without assignment since his release, in the preceding August, from his long and lonely imprisonment in the casemates of the harbor forts of New York, and, up to this moment, every suggestion looking to his employment had met the stern disapproval of the Secretary of War. Even when in the first flush of finding himself at last at the top notch of his career, Hooker, in firm possession, as he believed, of the post he had long coveted, as commander of the Army of the Potomac, had asked for Stone as his Chief of Staff, the request had been met by a flat refusal. A different fate awaited Banks's application. On the 7th of May Halleck issued the orders asked for, and in the last days of the month Stone reported for duty before Port Hudson. At first Banks was rather embarrassed by the gift he had solicited, for he saw that he himself was falling into disfavor at Washington; the moment was critical; and it was easy to perceive how disaster, or even the slightest check, might be magnified in the shadows of Ball's Bluff and Fort Lafayette. Moreover, Stone was equally unknown to and unknown by the troops of the Nineteenth Army Corps. Instead, therefore, of giving him the command of Sherman's division, for which his rank indicated him, Banks kept Stone at headquarters without special assignment, and made every use of his activity, as well as of his special knowledge and ready skill in all matters relating to ordnance and gunnery.

On the evening of the 26th of June a strange thing happened. While it was yet broad daylight Colonel Provence of the 16th Arkansas, posted in rear of the position of battery XXIV, discovering and annoyed by the progress made on battery 16 in his front, sent out, one at a time, two bold men, named Mieres and Parker, to see what was going on. After nightfall, on their report, he despatched thirty volunteers, under Lieutenant McKennon, to drive off the guard and the working party and destroy the works. The position was held by the advance guard of the 21st Maine, under Lieutenant Bartlett, who, for some reason hard to understand, ordered his men not to fire. The Arkansas party, therefore, accomplished its purpose, without further casualty than having one man knocked down, as he was leaping the parapet of the trench, by a soldier who happened to consider his orders as inapplicable to this method of defence. Then Major Merry, with the reserves of the 21st, coming promptly to the rescue, easily drove out the enterprising assailants, with whom went as prisoners Lieutenant Bartlett and five of his men, with fourteen muskets that had not been fired.(2)

As the saps in front of Bainbridge's and Duryea's batteries drew every day nearer to the bastion and the priest-cap, the working parties were harassed and began to be greatly delayed by the unceasing fire of the Confederate sharp-shooters. Moreover, in spite of the vigilance of the sharp-shooters in the trenches, their adversaries had so much the advantage of ground that they were able to render the passage of certain exposed points of the approaches slow and hazardous. At first, cotton bales were used to protect the head of the sap, but these the adventurous enemy set alight with blazing arrows or by sallies of small parties under cover of darkness. In the short night it was impossible to raise a pile of sand-bags high enough to overlook the breastworks. Toward the end of June this was changed in a single night by the skill and ingenuity of Colonel Edward Prince, of the 7th Illinois cavalry.