On the 24th of January, 1807, the regiment was suddenly embarked on board the fleet; but after a short cruise returned to Barbadoes, from whence it was removed to Grenada in April. The court of Denmark having united with France, in hostilities against Great Britain, an expedition was prepared against the Danish islands of _St. Thomas_ and _Santa Croix_, and the FIFTEENTH embarked from Grenada to take part in this service. These colonies surrendered on being summoned, and loss of life was thus prevented. [Sidenote: 1808] In July, 1808, a draft of six serjeants and two hundred and ninety-three rank and file joined from the second battalion. In November and the early part of December, the regiment lost about one hundred and fifty men from the effects of the climate of the West Indies. [Sidenote: 1809] The regiment joined the expedition under Lieut.-General Beckwith, which sailed from Carlisle-bay, Barbadoes, on the 28th of January, 1809, against the island of _Martinique_. The first division landed in Bay Robert, and the second near St. Luce and Point Solomon. The enemy's force was numerous, and some sharp fighting occurred, in which the regiment had the honor to distinguish itself, and had several men killed and wounded. The conquest of the island was achieved in a few weeks, and Lieut.-General Beckwith stated in his public despatch,--'The having commanded such an army will constitute the pride of my future life. To these brave troops, conducted by Generals of experience, their king and country owe the sovereignty of this important colony; and I trust, that by a comparison of the force which defended it, and the time in which it has fallen, the present reduction of Martinique will not be deemed eclipsed by any former expedition.' The royal authority was afterwards given for the regiment to bear the word "MARTINIQUE" on its colours, to commemorate its distinguished gallantry on this occasion. Lieut.-Colonel Riall received a medal for commanding a brigade, and Major Andrew Davidson for commanding the regiment. Three French sail of the line and two frigates, from L'Orient, having taken shelter in the _Saints_, in the vicinity of Guadaloupe, they were blockaded by Rear-Admiral Sir Alexander Cochrane; and three thousand men, of which force the FIFTEENTH formed part, were detached, under Major-General Maitland, for the reduction of the islands. This expedition sailed from Port Royal on the 12th of April; a landing was effected in Ance Bois Joly, and the difficult heights of Mount Russel, eight hundred feet high, were stormed and captured, and a battery soon forced the French shipping to put to sea. The reduction of the islands was accomplished in a few days, and the enemy's garrison was made prisoners of war. During the action on the 15th of April, Lieut.-Colonel Phineas Riall volunteered to storm Fort Morelli, with the FIFTEENTH regiment; but Major-General Maitland would not allow the corps to engage in so dangerous an enterprise.