Military career

Whitelocke entered the army in 1778 and served in Jamaica

Jamaica

Jamaica is an island nation of the Greater Antilles, in length, up to in width and 10,990 square kilometres in area. It is situated in the Caribbean Sea, about south of Cuba, and west of Hispaniola, the island harbouring the nation-states Haiti and the Dominican Republic...

 and in San Domingo. In 1805 he was made a lieutenant-general and inspector-general of recruiting, and in 1807 he was appointed to command an expedition to seize Buenos Aires

Buenos Aires

Buenos Aires is the capital and largest city of Argentina, and the second-largest metropolitan area in South America, after São Paulo. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the South American continent...

 from the Spanish Empire, which was in disarray due to events in Europe. The attack failed and the British surrendered after suffering heavy losses. Whitelocke undertook negotiations with the opposing general, Santiago de Liniers

Santiago de Liniers

Jacques de Liniers was a French officer in the Spanish military service, and a viceroy of the Spanish colonies of the Viceroyalty of the Río de la Plata. He is more widely known by the Spanish form of his name, Santiago de Liniers...

, and having decided that the British position was untenable, signed the surrender and ordered the British forces to abandon Montevideo

Montevideo

Montevideo is the largest city, the capital, and the chief port of Uruguay. The settlement was established in 1726 by Bruno Mauricio de Zabala, as a strategic move amidst a Spanish-Portuguese dispute over the platine region, and as a counter to the Portuguese colony at Colonia del Sacramento...

 and return home later that year.

This proceeding was regarded with great disfavour by many under his command and the British army and public, and its author was brought before a court-martial

Court-martial

A court-martial is a military court. A court-martial is empowered to determine the guilt of members of the armed forces subject to military law, and, if the defendant is found guilty, to decide upon punishment.Most militaries maintain a court-martial system to try cases in which a breach of...

 convened at The Royal Hospital

Royal Hospital Chelsea

The Royal Hospital Chelsea is a retirement home and nursing home for British soldiers who are unfit for further duty due to injury or old age, located in the Chelsea region of central London, now the Royal Borough of Kensington and Chelsea. It is a true hospital in the original sense of the word,...

  in London

London

London is the capital city of :England and the :United Kingdom, the largest metropolitan area in the United Kingdom, and the largest urban zone in the European Union by most measures. Located on the River Thames, London has been a major settlement for two millennia, its history going back to its...

 in 1808. On all the charges, except one, he was found guilty and he was dismissed from the service. He lived in retirement until his death at Hall Barn Park, Beaconsfield

Beaconsfield

Beaconsfield is a market town and civil parish operating as a town council within the South Bucks district in Buckinghamshire, England. It lies northwest of Charing Cross in Central London, and south-east of the county town of Aylesbury...

, Buckinghamshire

Buckinghamshire

Buckinghamshire is a ceremonial and non-metropolitan home county in South East England. The county town is Aylesbury, the largest town in the ceremonial county is Milton Keynes and largest town in the non-metropolitan county is High Wycombe....

on 23 October 1833.