The Braddock Expedition is soundly defeated by a smaller French and Native American force in its attempt to capture Fort Duquesne in what is now downtown Pittsburgh.

The Braddock Expedition, also known as Braddock's Campaign or Braddock's Defeat, was a British military expedition which attempted to capture Fort Duquesne from the French in 1755 during the French and Indian War. The expedition, named after its commander General Edward Braddock, was defeated at the Battle of the Monongahela on July 9 and forced to retreat; Braddock was killed in action along with more than 500 of his troops. It ultimately proved to be a major setback for the British in the early stages of the war; the historian John Mack Faragher claimed the expedition was one of the most disastrous defeats suffered by British forces during the 18th century.