Field Marshal Sir John Michel, was a British Army officer. He commanded the 6th Regiment of Foot during the Eighth Xhosa War in 1851 and served as Chief of Staff of the British Army's Turkish contingent during the Crimean War in 1854 before transferring to India where he commanded the Malwa Field Force which pursued Tatya Tope in the aftermath of the Indian Mutiny. He then commanded the 1st Division at the Battle of Taku Forts in August 1860 during the Second Opium War and took part in the burning of the Old Summer Palace at Peking in October 1860 as a reprisal for the torture and murder of British prisoners before being appointed Commander of British Troops in China and Hong Kong in 1861. He later commanded the forces in British North America playing a key role in the organization of the militia volunteers in resistance to the Fenian raids invasions in 1866. His last appointment was as Commander-in-Chief of Ireland in 1875.

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.