Their failure to stop the Confederates directly contributed to the southern victory of the Second Battle of Manassas. During the Spanish-American War 10,000 American troops were camped in and around Thoroughfare Gap for six months while waiting transport to battle.
Owner John Chapman sued the government for damages but lost and his business never recovered. Mr. Chapman's family committed him to an asylum in 1864. Beverley Mill's continued its milling functions until 1951. When Interstate 66 was built, the road was rerouted in order to leave Beverley's Mill undisturbed.