Field Marshal Stapleton Cotton, 1st Viscount Combermere, was a British Army officer, diplomat and politician. As a junior officer, he took part in the Flanders Campaign, in the Fourth Anglo-Mysore War and in the suppression of Robert Emmet's insurrection in 1803. He commanded a cavalry brigade in Sir Arthur Wellesley's Army before being given overall command of the cavalry in the latter stages of the Peninsular War. He went on to be Commander-in-Chief, Ireland and then Commander-in-Chief, India. In the latter role he stormed Bharatpur—a fort which previously had been deemed impregnable.

Field marshal (FM) has been the highest rank in the British Army since 1736. A five-star rank with NATO code OF-10, it is equivalent to an Admiral of the Fleet in the Royal Navy or a Marshal of the Royal Air Force in the Royal Air Force (RAF). A Field Marshal's insignia consists of two crossed batons surrounded by yellow leaves below the Tudor Crown. Like Marshals of the Royal Air Force and Admirals of the Fleet, Field Marshals traditionally remain officers for life, though on half-pay when not in an appointment or retired. The rank has been used sporadically throughout its history, and was vacant during parts of the 18th and 19th centuries. After the Second World War, it became standard practice to appoint the Chief of the Imperial General Staff to the rank on his last day in the post. Army officers occupying the post of Chief of the Defence Staff, the professional head of all the British Armed Forces, were usually promoted to the rank upon their appointment.