Mutiny is a revolt among a group of people (typically of a military, of a crew, or of a crew of pirates) to oppose, change, or remove superiors or their orders. The term is commonly used for insubordination by members of the military against an officer or superior, but it can also sometimes mean any type of rebellion against any force. Mutiny does not necessarily need to refer to a military force and can describe a political, economic, or power structure in which subordinates defy superiors.
During the Age of Discovery, mutiny particularly meant open rebellion against a ship's captain. This occurred, for example, during Ferdinand Magellan's journeys around the world, resulting in the killing of one mutineer, the execution of another, and the marooning of others; on Henry Hudson's Discovery, resulting in Hudson and others being set adrift in a boat; and the notorious mutiny on the Bounty.
Those convicted of mutiny often faced capital punishment.
Until 1689, mutiny was regulated in England by Articles of War instituted by the monarch and effective only in a period of war. In 1689, the first Mutiny Act was approved, which passed the responsibility to enforce discipline within the military to Parliament. The Mutiny Act, altered in 1803, and the Articles of War defined the nature and punishment of mutiny until the latter were replaced by the Army Discipline and Regulation Act in 1879. This, in turn, was replaced by the Army Act in 1881.
Today the Army Act 1955 defines mutiny as follows:
Mutiny means a combination between two or more persons subject to service law, or between persons two at least of whom are subject to service law—
(a) to overthrow or resist lawful authority in Her Majesty's forces or any forces co-operating therewith or in any part of any of the said forces,
(b) to disobey such authority in such circumstances as to make the disobedience subversive of discipline, or with the object of avoiding any duty or service against, or in connection with operations against, the enemy, or
(c) to impede the performance of any duty or service in Her Majesty's forces or in any forces co-operating therewith or in any part of any of the said forces.