On the 29th of June, at mid-day, the French were driven from a point of land, near the Main, called the Bleiau. In this affair, a vessel, with 78 Prussians on board, drove from her anchor, owing to the unskilfulness of the crew, and, during a fire, by which eight men were killed, made towards the city. The Prussians were taken prisoners, and exchanged the next day. At night, the bombardment was renewed; the Domprobstei, or palace of the Provost, was burned and several of the neighbouring residences; in other parts of the city, some houses were reduced to ashes.

The next night, the church of the Franciscans and several other public buildings were destroyed. A dreadful fire, on the night of the 2d and 4th of June, consumed the chapel of St. Alban. Families in the southern part of the city now constantly passed the night in their cellars; in the day-time, they ventured into their usual apartments; for the batteries of the besiegers were by far the most terrible, at night, when the whole city was a sufficient mark for them, though their works could scarcely be discerned by the garrison. In the day-time, the exactness of the French gunners frequently did great injury to the batteries, which, at night, were repaired and used with equal effect against the city.

St. Alban's fort was now demolished, so that the besieged withdrew their cannon from it. Elizabeth fort was also much damaged. A strong work, which the French had raised, in prolongation of the glacis, divided the opinions of the Prussian engineers. Some thought it should be preserved, when taken, because it would command part of the town; others, that it should be demolished. The latter opinion prevailed, and, in the night of the 5th and 6th, General Manstein was ordered to make the attack with three battalions. He perfectly succeeded, as to the nearest part of the work; but the other, on account of its solid foundation, could not be entirely destroyed. In the mean time, two battalions were sent, under cover of the darkness, to attack the Zahlbach fort, a part of which they carried by storm; but the reinforcements, immediately supplied by the garrison, obliged them to retire. Two Prussian officers were killed; one wounded, and another, with one-and-thirty men, taken. The Prussians lost in all 183 men; the French had twelve killed and forty-seven wounded.

On the 6th of July, the French repaired the damaged fort, the distance of it from the Prussians preventing the latter from hindering them.

At night, General Kleist carried the fort, at Zahlbach, by a second attack, and demolished it; at the same time, some batteries of the second parallel were perfected. The French could not support the loss of this fort; on the 7th, they attacked the scite; carried it, after a severe contest; and rebuilt it. At night, they were driven back again and the fort entirely destroyed. In the same night they were driven from Kostheim, after a furious battle, by the Prussian General Schonfield. During this engagement, the rapid succession of flashes and explosion of bombs seemed to fill the air with flame. A Prussian detachment having been posted on the road to Cassel, in order to prevent the garrison of that place from sending succour to Kostheim, this road was so strongly bombarded by the French, that seven bombs were frequently seen in the air at once. The loss was great, on both sides, in this engagement, after which the Council in the city resolved, to make no more attempts upon Kostheim, on account of the distance.

The following night, the fire was less than usual, but a few bombs and grenades fell in the city, where the inhabitants had now learned to extinguish such as grounded, before their fusees were consumed. They also formed themselves into parties for the ready suppression of fires. The next morning, the garrison saw the works of the besiegers brought to within two hundred and fifty paces of the walls.

About this time, the sickliness of the garrison became apparent, and General D'Oyré informed the Council, that, on account of this and of the fatiguing service of the works, he feared the defence could not be much longer continued. He lamented, that the troops of the line were so few, and the others so inexperienced.

For several nights, the works of the besiegers were eagerly pushed, but still they were not so forward, as had been expected. Some of the besieging corps began to be sickly; the King of Prussia having resolved to employ no more labourers, it was reckoned, that the soldiers, for eight-and-forty hours of work, had only eighteen of rest. On the other hand, they were assured, that the garrison must be equally fatigued, since, in such an extensive fortification, none could be left long unemployed.

The French had been, for some time, busied in forming what is called a Fleche at the head of one of their forts, and this was thought necessary to be destroyed. It was attacked in the night of the 12th and 13th by the Austrians; but so much time was passed in their operations, that the French fell upon them, in great force, about two in the morning, and beat them away, with loss. The Austrians were as little employed as possible in services of this fort.

On the 13th of July, another battery was stormed by the Prussians; but, as the officer, unlike the Austrians, advanced with too little caution, his party was much hurt by some pieces of concealed cannon, and the enterprise failed.