The militia is the natural defense of a free country against sudden foreign invasions, domestic insurrections, and domestic usurpation of power by rulers. The right of the citizens to keep and bear arms has justly been considered, as the palladium of the liberties of the republic; since it offers a strong moral check against the usurpation and arbitrary power of rulers; and will generally ... enable the people to resist and triumph over them.
Joseph Story (1833). “Commentaries on the Constitution of the United States: With a Preliminary Review of the Constitutional History of the Colonies and States, Before the Adoption of the Constitution”, p.746