It having been agreed, by the two commanders in chief, Lord Hood and Lieutenant-General the Honourable Charles Stuart, that the utmost dispatch was necessary, in order to enable the troops selected for the siege of Calvi to begin their operations before the commencement of the unhealthy season, every effort was used to forward the necessary preparations; and so effectual were the exertions of the different departments, that the regiments embarked at Bastia in the course of a very few days. Captain Nelson, accordingly, who had been detached on the 9th of June, by Lord Hood, from the fleet off Mortella Bay, to take the charge of these embarkations, in his lordship's absence, agreed that they should proceed to Port Agra, where a landing was effected on the 19th of the same month; and, on that very day, the army encamped, in a strong position, on the Serra del Cappucine, a ridge of mountains three miles distant from the town of Calvi. From many of the out-posts, and particularly from those which the friendly Corsicans were ordered to occupy, it was distinctly discoverable that the town of Calvi was strong in point of situation, well fortified, and amply supplied with heavy artillery. The exterior defences, on which the enemy had bestowed a considerable labour, consisted in the bomb-proof Stone Star Fort Mozello, mounting ten pieces of ordnance, with a battery of six guns on it's right, flanked by a small entrenchment. In the rear of this line, which covered the town to the westward, was placed, on a rocky hill to the east, a battery of three guns. Considerably advanced on the plain to the south-west, the Fort Mollinochesco, on a steep rock, commanded the communication between Calvi and the province of Balagori; supported by two frigates, moored in the bay, for the purpose of raking the intermediate country. The principal difficulties, however, in approaching the enemy's works, did not so much arise from the strength of the defences, as from the height of the mountains and rugged rocky surface of the country it was necessary to penetrate; and so considerable were these obstacles, against the usual mode of attack, that it was judged expedient to adopt rapid and forward movements, instead of regular approaches. In conformity to this plan of proceeding, the seamen and soldiers were laboriously employed in making roads; dragging guns to the tops of the mountains; and collecting military stores, for the purpose of erecting two mortar and four separate gun batteries, on the same night. One of these was intended against the Mollinochesco; the second, to be constructed on rocks, to cover the principal one, of six guns; which, by a sudden march, and the exertions of the whole army, was to be erected within seven hundred and fifty yards of the Mozello.