Henry Knox (July 25, 1750 – October 25, 1806) was a military officer of the Continental Army and later the United States Army, and also served as the first United States Secretary of War.
Born and raised in Boston, Massachusetts, he owned and operated a bookstore there, cultivating an interest in military history and joining a local artillery company. When the American Revolutionary War broke out in 1775, he befriended General George Washington, and quickly rose to become the chief artillery officer of the Continental Army. In this role he accompanied Washington on most of his campaigns, and had some involvement in many major actions of the war. He established training centers for artillerymen and manufacturing facilities for weaponry that were valuable assets to the fledgling nation.
Following the adoption of the United States Constitution, he became President Washington's Secretary of War. In this role he oversaw the development of coastal fortifications, worked to improve the preparedness of local militia, and oversaw the nation's military activity in the Northwest Indian War. He was formally responsible for the nation's relationship with the Indian population in the territories it claimed, at one point arguing that the country could take by force lands that Indian tribes were unwilling to sell.