Mercer was a doctor who fled Scotland after the Battle of Culloden.

He travelled to Pennsylvania, where he met Colonel George Washington during the French and Indian War and later moved to Fredericksburg, Virginia, on Washington's advice to practice medicine and operate an apothecary.

[4] It also includes a small exhibit on Mercer's life and contributions to the American Revolutionary War.

[5] In mid-2012, Preservation Virginia signed an agreement passing ownership to the "Washington Heritage Museums" group beginning in 2013.

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