The Green Mountain Boys were a militia organization established in 1770 in the territory between the British provinces of New York and New Hampshire, known as the New Hampshire Grants and later in 1777 as the Vermont Republic (which later became the state of Vermont). Headed by Ethan Allen and members of his extended family, it was instrumental in resisting New York's attempts to control the territory, over which it had won de jure control in a territorial dispute with New Hampshire.
Some companies served in the American Revolutionary War, including notably when the Green Mountain Boys, led under the command of Ethan Allen while being assisted by Benedict Arnold, captured Fort Ticonderoga on Lake Champlain on May 10, 1775, and invaded Canada later in 1775. In early June 1775, Ethan Allen and his then subordinate, Seth Warner, induced the Continental Congress at Philadelphia to create a Continental Army ranger regiment from the then New Hampshire Grants. Having no treasury, the Congress directed that New York's revolutionary Congress pay for the newly authorized regiment. In July 1775, Allen's militia was granted support from the New York revolutionary Congress.