A coup d'état (, ; plural: coups d'état)—also known as a coup, putsch, and overthrow—is the sudden, illegal deposition of a government, usually by a small group of the existing state establishment—typically the military—to replace the deposed government with another body; either civil or military. A coup d'état succeeds when the usurpers establish their legitimacy if the attacked government fails to thwart them, by allowing their (strategic, tactical, political) consolidation and then receiving the deposed government's surrender; or the acquiescence of the populace and the non-participan...