{"nrhp_refnum":"99001374","name":"Thoroughfare Gap Battlefield","other_names":["DHR File No. 30-1016"],"category":"site","location":{"address":"Jct. VA 55 and I-66","address_restricted":false,"city":"Broad Run","county":"Prince William County","state":"VA","lat":38.823199722000055,"lon":-77.7114738318782,"geom_source":"nps_gis"},"listed_date":"1999-11-18","is_nhl":false,"nhl_designated_date":null,"areas_of_significance":["Military"],"significance_levels":["national"],"summary":{"what_it_is":"A roughly 514-acre Civil War battlefield site at Thoroughfare Gap, a pass through the Bull Run Mountains on the Prince William and Fauquier county line near Broad Run, Virginia. It includes mill ruins, a house ruin, an ice pit, a family cemetery, a quarry trench, a millrace and a railroad.","why_significant":"The August 28, 1862 Battle of Thoroughfare Gap let Confederate forces under Lee and Longstreet pass through the mountains to rejoin Jackson before the Second Battle of Manassas. The Gap was also an early strategic use of rail for military movement. Many of the resources present during the fighting survive and keep a high degree of integrity.","narrative":"Thoroughfare Gap is a narrow pass through the Bull Run Mountains on the line between Prince William and Fauquier counties, Virginia, long used as a protected route between Northern Virginia and the Shenandoah Valley. On August 28, 1862, Confederate and Union forces fought here as Robert E. Lee and James Longstreet tried to pass through and reunite with Stonewall Jackson ahead of the Second Battle of Manassas. Confederate troops held the high ground on both sides of the Gap and sent a brigade over the mountain to turn the Union flank, forcing Union troops to retreat. The battlefield took in two stone gristmills, the Chapman house known as Meadowland, an ice pit, a family cemetery, a long quarry trench, a millrace and the Manassas Gap Railroad. Several of these now stand as ruins, but the landscape has changed little apart from Interstate 66 and denser tree cover. The Gap was also an early example of military use of a railroad.","period_of_significance":"1861-1865","architect_builder":"Unknown","architectural_style":null,"criteria":["A"],"status_note":"Many historic buildings are ruins and the landscape is now largely wooded. Several noncontributing buildings are described as abandoned. Current function listed includes outdoor recreation, conservation area and vacant/not in use.","vacant_flag":null,"machine_generated":true,"model":"claude-sonnet-5-5","prompt_version":"v1.0-2026-10-29","generated_at":"2026-10-29 02:52:00.341404-05","source_pdf":"https://s3.amazonaws.com/NARAprodstorage/opastorage/live/59/6827/41682759/content/electronic-records/rg-079/NPS_VA/99001374.pdf"},"photo":{"url_800":"https://nationalhistoricalregister.com/media/99001374/ff5027d921-800.webp","url_1600":"https://nationalhistoricalregister.com/media/99001374/ff5027d921-1600.webp","licence":"CC BY-SA 3.0","author":"Nickmorgan2","credit_html":"<a href=\"https://commons.wikimedia.org/wiki/File:Thoroughfare_Gap_Marker_and_Beverley_Mill.jpeg\" rel=\"noopener\">Nickmorgan2</a>, <a href=\"https://creativecommons.org/licenses/by-sa/3.0\" rel=\"license noopener\">CC BY-SA 3.0</a>, via Wikimedia Commons","source_page":"https://commons.wikimedia.org/wiki/File:Thoroughfare_Gap_Marker_and_Beverley_Mill.jpeg"},"district":null,"sources":{"nps_snapshot_date":"2026-05-22","nara_catalog":"https://catalog.archives.gov/id/41682759","wikipedia":"https://en.wikipedia.org/wiki/Thoroughfare_Gap_Battlefield","wikidata":"https://www.wikidata.org/wiki/Q16901611"},"indexable":true,"url":"https://nationalhistoricalregister.com/virginia/prince-william-county/thoroughfare-gap-battlefield-99001374/"}