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.

Owing to some mistake, the proposed battery against the Mollinochesco was built and opened two days earlier than the time appointed.  Observing, however, that though this fort was considerably damaged, it seemed evidently the intention of the enemy to repair rather than evacuate it, on the evening of the 6th of July, the Royal Irish regiment was ordered to move towards their left, exposing the men to the fire of their artillery.  At sun set, and during the greatest part of the night, this diversion was seconded by a feigned attack of the Corsicans:  which so effectually deceived the enemy, that they withdrew a considerable piquet from the spot where the principal battery was to be constructed, in order to support the Mollinochesco; and, directing the whole of their fire to that point, enabled the troops to complete their work.

This important position established, the enemy was compelled to evacuate the Mollinochesco, and to withdraw the shipping under the protection of the town.

A heavy firing immediately commenced on both sides; which continued, with little intermission, till the 18th of that month:  when, observing that their batteries were considerably damaged, and a breach appearing practicable on the west side of the Mozello, a disposition was made for a general attack on the outworks, under cover of two batteries ordered to be erected that night; which would, from their position, in the event of a check, appear the principal object of the movement.

By the greatest exertions, this battery was completely constructed, without discovery, within three hundred yards of the Mozello, an hour before day-break:  a signal gun was then fired from it, for the troops to advance.  Covered, in their approach, by two field pieces, they proceeded, with a cool and steady confidence, and unloaded arms, towards the enemy; forced their way through a smart fire of musquetry; and, regardless of live shells thrown into the trench, or the additional defence of pikes, stormed the Mozello:  while the Royal Irish regiment, with two pieces of cannon, equally regardless of opposition, carried the enemy’s battery on the left, and forced their trenches, without firing a shot.

The possession of these very important posts, which the troops maintained under the heaviest fire of shells, shot, and grape, induced an offer to consider such terms as the garrison of Calvi might incline to propose.