The Green Mountain Boys, a militia group from the Vermont region, are particularly significant for their role in launching a surprise attack on Fort Ticonderoga during the American Revolutionary War. This attack occurred on May 10, 1775, and resulted in the capture of the fort from British forces. The victory was pivotal because it provided the Continental Army with much-needed artillery and supplies, including cannons and gunpowder, which were crucial in the early stages of the war.
So, the correct significance of the Green Mountain Boys would be that they secured valuable supplies of gunpowder and cannons by capturing Fort Ticonderoga.