The only place in Corsica now remaining in the occupation of the French was Calvi, a well-fortified town on the western coast. Lieutenant-General the Hon. Charles Stuart, who on the day of the surrender of Bastia had arrived from England to replace Dundas, lost no time in reorganising his command, and then reconnoitred Calvi, where he was followed by Moore, who had been placed in command of a corps termed “the reserve,” and formed of the flank companies of the Royal Irish, the 50th, 51st, and the remains of the 2nd battalion of the Royals. Calvi was by no means an easy place to besiege, for it was surrounded on three sides by the sea and had good interior fortifications, with outer works of considerable strength. About eight hundred yards west of the town stood the Mozello, a bomb-proof, star-shaped fort, built of solid masonry and mounting ten guns; north of this fort was a smaller battery, flanked by an entrenchment, and to the east rose another battery of three guns. Two thousand yards south-west of the town the fort of Monteciesco commanded the approaches from the southward, which were also swept by the guns of two French frigates anchored in the bay. But though these works were formidable, Stuart considered that the “real strength of the defence lay in the height of the mountains and the rugged, rocky country over which it was necessary to penetrate. It was necessary to abandon regular approaches and to adopt rapid and forward movements.” He accordingly decided to bombard Fort Monteciesco with three 26-prs., and under cover of their fire to throw up a heavier battery at night within seven hundred and fifty yards of the Mozello. The labour of moving the guns, ammunition, and stores was immense, for roads had to be cut up the sides of steep hills nine hundred feet in height, and the cannon to be dragged by hand over the cliffs that overhang the landing-place. At the end of June more troops were brought round from Bastia; among them were the Royal Irish, recently reinforced by the return of the _Pompée_ detachment, which rejoined in time to share in the fatigues and dangers of the siege.