As tensions escalated before the American Revolutionary War, the British government grew alarmed at the concentration of arms and military supplies in New England. In response, on October 19, 1774, King George III issued a confidential Order in Council forbidding the export of arms and powder to America. When word of this order reached operatives in the New England patriot movement, it prompted urgent action to secure existing military stores before they could be confiscated or rendered inaccessible.
On December 14, 1774, local Patriots led by John Langdon stormed Fort William and Mary in Portsmouth, New Hampshire, which guarded the mouth of the busy seaport. They overcame a six-man caretaker detachment stationed at the fort and seized the garrison's powder supply. The following day, on December 15, 1774, patriots led by John Sullivan launched a second raid on the fort, this time capturing numerous cannons. The powder seized in the first raid was distributed through several towns in the colony for potential use in the anticipated conflict with Great Britain.
The capture of Fort William and Mary holds significant historical importance as one of the first overt acts of the American Revolutionary War. The cannons seized during the second raid were later employed in the pivotal Battle of Bunker Hill. Additionally, this engagement is notable as the only battle to take place in the state of New Hampshire during the Revolutionary War period.
European colonization of North America accelerated after 1600, with England, France, Spain, and the Netherlands establishing competing settlements along the Atlantic coast, the St. Lawrence River, the Gulf of Mexico, and the Mississippi Valley. The first permanent English settlement at Jamestown, Virginia (1607) struggled with starvation and conflict; the Plymouth colony (1620) and the Massachusetts Bay Colony (1630) followed. By the mid-1700s, thirteen English colonies stretched along the Atlantic seaboard, governed through a mix of royal charters, proprietary grants, and elected assemblies. The colonial economy depended on tobacco in Virginia and Maryland, rice and indigo in the Carolinas, and maritime trade in New England — all increasingly reliant on enslaved African labor after 1619. Conflict with Indigenous peoples over land was continuous, punctuated by major wars including King Philip's War (1675–1676) in New England and the Yamasee War (1715–1717) in the South. The French and Indian War (1754–1763), part of the global Seven Years' War, ended French power in North America and left Britain deeply in debt — triggering the taxation disputes that would lead to revolution.
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