Field Marshal Lord Frederick Cavendish (August 1729 – 21 October 1803) was a British Army officer and Whig politician.

After his release, Prince Ferdinand of Brunswick gave him command of a brigade of chasseurs which he led to victory at the Battle of Wilhelmsthal in June 1762.

[1] Cavendish was promoted to captain in the 1st Regiment of Foot Guards and lieutenant-colonel in the Army on 1 June 1756[4] and served as an aide-de-camp to the Duke of Cumberland in Germany in Summer 1757 during the early stages of the Seven Years' War.

[2] He commanded the rear-guard during the re-embarkation following the disastrous battle of Saint Cast in September 1758 and, having been taken prisoner, gallantly offered to remain in captivity on the basis that he was a Member of Parliament.

[6] Promoted to major-general on 7 March 1761, he sailed for Germany where Prince Ferdinand of Brunswick gave him command of a brigade of chasseurs which he led to victory at the Battle of Wilhelmsthal in June 1762.