Fort Dearborn was a United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 fort built in 1803 beside the Chicago River

Chicago River

The Chicago River is a system of rivers and canals with a combined length of that runs through the city of the same name, including its center . Though not especially long, the river is notable for being the reason why Chicago became an important location, as the link between the Great Lakes and...

 in what is now Chicago

Chicago

Chicago is the largest city in the US state of Illinois. With nearly 2.7 million residents, it is the most populous city in the Midwestern United States and the third most populous in the US, after New York City and Los Angeles...

, Illinois. It was constructed by troops under Captain John Whistler

John Whistler

John Whistler was a soldier, born in Ulster, Ireland. He ran away from home when a boy, enlisted in the British army, and served under General John Burgoyne during the American Revolutionary War. After the surrender at Saratoga, John returned to England and was honorably discharged...

 and named in honor of Henry Dearborn

Henry Dearborn

Henry Dearborn was an American physician, a statesman and a veteran of both the American Revolutionary War and the War of 1812. Born to Simon Dearborn and Sarah Marston in North Hampton, New Hampshire, he spent much of his youth in Epping, where he attended public schools...

, then United States Secretary of War

United States Secretary of War

The Secretary of War was a member of the United States President's Cabinet, beginning with George Washington's administration. A similar position, called either "Secretary at War" or "Secretary of War," was appointed to serve the Congress of the Confederation under the Articles of Confederation...

. The original fort was destroyed following the Battle of Fort Dearborn in 1812, and a new fort was constructed on the same site in 1816. The fort was de-commissioned by 1837, and parts of the fort were lost to the widening of the Chicago River in 1855 and a fire in 1857; the last vestiges being destroyed in the Great Chicago Fire

Great Chicago Fire

The Great Chicago Fire was a conflagration that burned from Sunday, October 8, to early Tuesday, October 10, 1871, killing hundreds and destroying about in Chicago, Illinois. Though the fire was one of the largest U.S...

 of 1871.