The Battles of Lexington and Concord were of minor military significance but of world-historical importance in the modern era. They were the first military engagements of the Revolutionary War, marking the outbreak of armed conflict between Great Britain and its thirteen colonies on the North American mainland. Fought on April 19, 1775, the battles of Lexington and Concord ruin British political strategy of ending colonial opposition to the Intolerable Acts and seizing weapons of rebels. Revolutionary leaders such as John Adams considered the battle to be a point of no return: “The Die was cast, the Rubicon crossed,” he said.