Promoted to lieutenant in 1747, and to captain in 1756.[1] Forbes remained in Portugal after the termination of the Seven Years' War (1756–1763); as a Roman Catholic who had married a Portuguese lady, he had no difficulty in getting employment.[2]
In 1763, Count Lippe gave him command of a company of Grenadiers in the Peniche Regiment, a great honour as these companies were then an elite corps.[1] In 1766 he was promoted to lieutenant colonel of that regiment and the following year to full colonel of the Almeida Cavalry Regiment. In 1773 he was transferred to the Elvas Regiment. In 1775 he was promoted to brigadier, whilst retaining the colonelcy and command of the Bragança Cavalry Regiment.[1]
In 1778 he was appointed military governor of the province of Beira.[1]
He served for many years as adjutant-general of the Portuguese army, but at last, in 1789, he was asked to resign, the object of some jealousy of the Portuguese officers.[2] In 1793 he was made a knight of the order of Aviz, and promoted to lieutenant general.[1]
When Portugal decided to join the French Revolutionary Wars, Forbes was given command, replacing the Marquis de Minas, his old commander in the 1762 campaigns, who had fallen ill[3] of the 5,000-strong division which, together with a 22-gun brigade of Artillery, was sent as an expeditionary force to assist the Spanish army in the War of the Pyrenees (1793–1795). Setting sail from the estuary of the Tagus towards the end of September 1793, the expedition, accompanied by several high-ranking volunteers, including Admiral Domingos Xavier de Lima, 7th Marquis of Nice; Hugh Percy, 2nd Duke of Northumberland and the Prince de Montmorency, arrived at Roses on 9 November.[4]
^Almeida, Fortunato de (1926). Historia de Portugal - Livro VIII. University of Coimbra (this and subsequent pages quote details of Gen. Forbes's reports to the Portuguese Government on the expedition to Catalonia). p. 453.
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