The Massachusetts Bay Colony organizes three militia regiments to defend the colony against the Pequot Indians, a date now considered the founding of the National Guard of the United States.

The Massachusetts Bay Colony (1628–1691), more formally the Colony of Massachusetts Bay, was an English settlement on the east coast of North America around Massachusetts Bay, one of the several colonies later reorganized as the Province of Massachusetts Bay. The lands of the settlement were in southern New England, with initial settlements on two natural harbors and surrounding land about 15.4 miles (24.8 km) apart—the areas around Salem and Boston, north of the previously established Plymouth Colony. The territory nominally administered by the Massachusetts Bay Colony covered much of central New England, including portions of Massachusetts, Maine, New Hampshire, and Connecticut.

A militia is a military or paramilitary force that comprises civilian members, as opposed to a professional standing army of regular, full-time military personnel. Militias may be raised in times of need to support regular troops or serve as a pool of available manpower for regular forces to draw from.

The Pequot are a Native American people of Connecticut. The modern Pequot are members of the federally recognized Mashantucket Pequot Tribe, four other state-recognized groups in Connecticut including the Eastern Pequot Tribal Nation, or the Brothertown Indians of Wisconsin. They historically spoke Pequot, a dialect of the Mohegan-Pequot language, which became extinct by the early 20th century. Some tribal members are undertaking revival efforts.

Native Americans are the Indigenous peoples of the United States, particularly of the lower 48 states and Alaska. They may also include any Americans whose origins lie in any of the indigenous peoples of North or South America. The United States Census Bureau publishes data about "American Indians and Alaska Natives", whom it defines as anyone "having origins in any of the original peoples of North and South America ... and who maintains tribal affiliation or community attachment". The census does not, however, enumerate "Native Americans" as such, noting that the latter term can encompass a broader set of groups, e.g. Native Hawaiians, which it tabulates separately.