On December 14, 1774, more than 400 New Hampshire Seacoast-area patriots mobbed the gates of the William and Mary fort following the visit of Paul Revere confirming rumors of English ships and troops on the way.
Within hours, the fort was overwhelmed and the patriots made away with 97 barrels of powder later distributed to militias throughout the state as building blocks for the nascent continental army.
Additional Sources:
http://www.history.org/foundation/journal/Summer06/plots.cfm