Hugh Mercer (circa 1720-January 3, 1777) was an officer in the Continental Army in the American Revolutionary War.
Born in Rosehearty, Scotland he attended the University of Aberdeen, studying medicine. He was assistant surgeon in the army of Bonnie Prince Charlie in 1745. In 1747 he settled in Mercersburg, Pennsylvania. He was wounded in General Edward Braddock's army in 1755. In 1776, at the request of General George Washington, he was commissioned a brigadier general. He died from wounds suffered at the Battle of Princeton.
Mercer County, New Jersey, Mercer County, Ohio, and Mercer County, Illinois are named for him.
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