Dearborn, Henry (1751–1829), a United States army officer. He distinguished himself in the American Revolution and was later a representative in Congress from Massachusetts (1793–97) and secretary of war in Jefferson's cabinet (1801–09). Fort Dearborn, on the site of present-day Chicago, was named for him.
Dearborn was born in Hampton, New Hampshire. He was a physician in Portsmouth, New Hampshire, when he heard of the Battle of Lexington. He set out at once with a company of volunteers, and the next day arrived at Cambridge, 65 miles (105 km) away. Dearborn was made a captain and served in the battle of Bunker Hill. He was with Benedict Arnold on the Quebec expedition and was a major under Horatio Gates at the capture of the British general Burgoyne. He led a daring charge at the Battle of Monmouth and was in the final campaign at Yorktown.
As a major general, Dearborn became senior officer of the U.S. Army in 1812, but proved to be a bungling, incompetent commander in the War of 1812. He left the army in 1815. Dearborn was minister to Portugal, 1822–24.