CHARLES O'HARA was appointed cornet in the third dragoons in December, 1752, and in 1756 he was promoted to lieutenant and captain in the second foot guards. He served in Portugal in 1762, and performed the duties of quartermaster-general to the army under Lieut.-General the Earl of Loudoun. In 1769 he was promoted to the rank of captain and lieut.-colonel; and he served with his regiment in North America. In the autumn of 1781 he was promoted to the rank of major-general. He commanded the brigade of foot guards under Lieut.-General Earl Cornwallis, in Virginia; distinguished himself at the passage of the Catawba river on the 1st of February, 1781; and was wounded at the battle of Guildford on the 15th of March. In 1782 he was nominated to the colonelcy of the TWENTY-SECOND regiment; was removed to the Seventy-fourth highlanders in 1791, and was advanced to the rank of lieut.-general in 1793. He commanded the British troops at Toulon, and was wounded and taken prisoner in an action with the French republican troops on the 30th of November, 1793. His services were rewarded with the appointment of governor of Gibraltar, and in 1798 he was promoted to the rank of general. It is recorded that he possessed a happy combination of talents; was a brave and enterprising soldier, a strict disciplinarian, and a polite and accomplished gentleman. He died at Gibraltar on the 21st of February, 1802. DAVID DUNDAS. _Appointed 2nd April, 1791._ DAVID DUNDAS was one of the most distinguished officers of the age in which he lived, for his perfect knowledge of the principles of military tactics. He commenced his military education at the age of thirteen in the academy at Woolwich, and at fifteen he assisted in a survey of Scotland; in 1756 he obtained a commission in the Fifty-sixth regiment. In 1758 he proceeded with the expedition to the coast of France as an assistant quartermaster-general; and in the following year obtained the command of a troop in a newly raised regiment of light dragoons (Eliott's light horse), now the fifteenth, or King's hussars. He served with his regiment in Germany in 1760 and 1761; in the following summer he accompanied an expedition to Cuba, as aide-de-camp to Major-General Eliott, and was actively employed in the reduction of the Havannah. After the peace he resumed his post in his regiment, in which he rose to the rank of major; and, urged by an ardent desire to acquire a perfect knowledge of every branch of his profession, he obtained permission to proceed to the Continent, to observe the practice of the French and Austrian armies. In 1775 he obtained the lieut.-colonelcy of the twelfth light dragoons, joined the regiment in Ireland shortly afterwards, and in 1778 received the appointment of quartermaster-general in that country. In 1782 he was removed to the lieut.-colonelcy of the second Irish horse, now the fifth dragoon guards. In 1785 he again proceeded to the Continent,