Under orders from Governor Thomas Gage, British soldiers removed gunpowder from a magazine in the Province of Massachusetts Bay, which caused Patriots to prepare for war.

General Thomas Gage was a British Army officer and colonial administrator best known for his many years of service in North America, including serving as Commander-in-Chief, North America during the early days of the American Revolution.

A gunpowder magazine is a magazine (building) designed to store the explosive gunpowder in wooden barrels for safety. Gunpowder, until superseded, was a universal explosive used in the military and for civil engineering: both applications required storage magazines. Most magazines were purely functional and tended to be in remote and secure locations. They are the successor to the earlier powder towers and powder houses.

The Province of Massachusetts Bay was a colony in New England which became one of the thirteen original states of the United States. It was chartered on October 7, 1691, by William III and Mary II, the joint monarchs of the kingdoms of England, Scotland, and Ireland, and was based in the merging of several earlier British colonies in New England. The charter took effect on May 14, 1692, and included the Massachusetts Bay Colony, the Plymouth Colony, the Province of Maine, Martha's Vineyard, Nantucket, Nova Scotia, and New Brunswick; the Commonwealth of Massachusetts is the direct successor. Maine has been a separate state since 1820, and Nova Scotia and New Brunswick are now Canadian provinces, having been part of the colony only until 1697.

Patriots were colonists in the Thirteen Colonies who opposed the Kingdom of Great Britain's control and governance during the colonial era and supported and helped launch the American Revolution that ultimately established American independence. Patriot politicians led colonial opposition to British policies regarding the American colonies, eventually building support for the adoption of the Declaration of Independence, which was adopted unanimously by the Second Continental Congress on July 4, 1776.