Fort Loudoun was a historic fortification of the French and Indian War, located in what is now Winchester, Virginia. The fort was built between 1756 and 1758 under the supervision of George Washington, then a colonel in the militia of the British Province of Virginia. It was named for John Campbell, 4th Earl of Loudoun, who commanded the British forces in North America for a time during the war. Washington and his militia regiment were headquartered at the fort for two years. The fort was a roughly square bastioned earthworks, whose extent spread across where North Loudoun Street runs.