The cannonade now continued without intermission, but the enemy gained but little advantage. Every day, however, added to their strength, as fresh vessels with artillery continued to arrive from Pondicherry. They were now pushing their approaches from Lally's Battery towards the demi-bastion. The losses on the part of the besieged were considerable, many being killed and wounded each day. This continued to the end of the month, in spite of many gallant sorties by parties of the besiegers, who repeatedly killed and drove out the working parties in the head of the French trenches. These progressed steadily, and reached to the outworks of the demi-bastion.

On the 25th the Shaftesbury, one of the Company's trading vessels, commanded by Captain Inglis, was seen approaching. The five French ships hoisted English colours. A catamaran was sent out to warn her, and at nine o'clock in the evening she came to anchor. She had on board only some invalids, but brought the welcome news that three other ships, with troops, would soon be up. She had on board, too, thirty-seven chests of silver, and many military stores, among them hand grenades and large shell, which were most welcome to the garrison, who had nearly expended their supply. The native boats went off from the fort, and brought on shore the ammunition and stores.

In the afternoon the Shaftesbury was attacked by the two French ships, the Bristol and the Harlem. She fought them for two hours, and then sailed in and anchored again near the fort. The French ships lay off at a distance, and these and one of their batteries played upon the Shaftesbury after she had anchored, and continued to do so for the next three days.

Many of the guns of the fort were dismounted by the artillery fire, which had continued, with scarcely any intermission, for a month. The parapets of the ramparts were in many places beaten down, and the walls exposed to the enemy's fire greatly damaged. The enemy now opened their breaching battery close to the works, and on the 7th two breaches had been effected, and Lally ordered his principal engineer and artillery officers to give their opinion as to the practicability of an assault.

These, however, considered that the assault would have no prospect of success, as the guns commanding the ditch were still uninjured, and the palisades which stormers must climb over before reaching the breach untouched. So heavy a crossfire could be brought to bear by the besieged upon an assaulting column, that it would be swept away before it could mount the breach. These officers added their opinion that, considering the number of men defending the fort in comparison with those attacking it, final success could not be looked for, and further prosecution of the works would only entail a useless loss of life.

On the 9th of February, the French attacked Mahomed Issoof's men and those of Captain Preston; the whole under the command of Major Calliaud, who had come up from Trichinopoli, and had taken station three miles in rear of the French position. The greater part of the natives, as usual, behaved badly; but Calliaud, with the artillery and a few Sepoys, defended himself till nightfall; and then drew off.

For the next week the French continued to fire, and their approaches were pushed on. Several sorties were made, but matters remained unchanged until the 14th, when six English ships were seen standing into the roads; and that night the French drew out from their trenches, and retreated. The next morning six hundred troops landed from the ships, and the garrison, who had so stoutly resisted the assaults made upon them for forty-two days, sallied out to inspect the enemy's works. Fifty-two cannon were left in them, and so great was the hurry with which the French retreated that they left forty-four sick in the hospital behind.

The fort fired, during the siege, 26,554 rounds from their cannon, 7502 shells, threw 1990 hand grenades, and expended 200,000 musketry cartridges. Thirty pieces of cannon and five mortars had been dismounted during the siege. Of the Europeans, the loss in killed, wounded, and prisoners was five hundred and seventy-nine. Three hundred and twenty-two Sepoys were killed and wounded, and four hundred and forty deserted during the siege.

In spite of the resolution with which the French had pushed the siege, it was, from the first, destined to failure. The garrison were well provisioned, had great stores of ammunition, and plenty of spare cannon to replace those disabled or dismounted. The works were strong, and the garrison not greatly inferior in number to the besiegers. The French, on the other hand, had to bring their artillery, ammunition, and stores by water from Pondicherry; and the activity of the English parties in their rear rendered it extremely difficult for them to receive supplies of food, by land. Lally had disgusted even the French officers and soldiers by his arrogance, and passionate temper; while by the Sepoys he was absolutely hated.

During the siege, Charlie had been most active in the defence. Colonel Lawrence had assigned no special post to him, but used him as what would now be called his chief of the staff. He was ever where the fire was thickest, encouraging the men; and, during the intervals of comparative cessation of fire, he went about the fort, seeing to the comforts of the men in their quarters, to the issue of stores, and other matters.