Chantilly VA027
1862-09-01 to 1862-09-01 · VA · Northern Virginia Campaign [August 1862] · frozen result: Inconclusive · NPS summary (as listed)
Making a wide flank march, Jackson hoped to cut off the Union retreat from Bull Run. On September 1, beyond Chantilly Plantation on the Little River Turnpike near Ox Hill, Jackson sent his divisions against two Union divisions under Kearny and Stevens. Confederate attacks were stopped by fierce fighting during a severe thunderstorm. Union generals Stevens and Kearny were both killed. Recognizing that his army was still in danger at Fairfax Courthouse, Maj. Gen. Pope ordered the retreat to continue to Washington. With Pope no longer a threat, Lee turned his army west and north to invade Maryland, initiating the Maryland Campaign and the battles of South Mountain and Antietam. Maj. Gen. George B. McClellan assumed command of Union forces around Washington.
Dossier claims
Draft dossier, revision opening-strength-rationale-propagation-2026-09-25. Claims are extraction records with their quoted passages, not historical adjudication. JSON
information
supportedunresolved Ropes says Sumner's detachments perceived Jackson's march under a 3 a.m. order of Pope's, while darkness and rain kept Union officers from discovering the Confederate position.
Retrospective summary; no inspected reports or message chain.
Jackson's march had been perceived by the detachments which Sumner had sent outropes-northern-virginia-selections-v1, p.148 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…Our officers could not well discover the position of the enemy.ropes-northern-virginia-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…logistics
supportedunresolved Ropes says rain after August 30 made the fords near the turnpike impassable, and Jackson crossed Bull Run high up at Sudley Ford.
Route constraint from one retrospective history; no transport record inspected.
the fords near the turnpike were rendered impassable.ropes-northern-virginia-selections-v1, p.147 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…They crossed Bull Run high up, at Sudley Fordropes-northern-virginia-selections-v1, p.147 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…objectives
supportedunresolved NPS says Jackson hoped to cut off the Union retreat; Ropes says he aimed at Fairfax Court House to strike the Union line of communication.
Attributed purposes; no inspected order.
Jackson hoped to cut off the Union retreat from Bull Run.nps-va027-v1, Description · snapshot
9f3b5d7b662b…hoping to strike the Line of communication of the Federal armyropes-northern-virginia-selections-v1, p.147 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…outcome
supportedpost_outcome The frozen result is Inconclusive (Confederate strategic victory); the live NPS field reads Indecisive. Ropes calls the engagement indecisive, a repulse after which Pope withdrew into the Washington lines.
Retain the original result and engagement interval; later movements and campaign contribution are different measures. No new probabilities or individual causal credit. The strategic qualifier is a campaign-level label, not a tactical margin.
Inconclusive (Confederate strategic victory.)arnold-cwsac-battles, battle VA027; column results_text · snapshot
952b5d08402a…the indecisive character of the engagementropes-northern-virginia-selections-v1, p.150 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…supportedpost_outcome The frozen casualty text and live field agree: 2,100 total (US 1,300; CS 800).
Original casualty returns were not inspected; preserve totals, categories, cutoffs and differences. No canonical reconciliation or casualty-based opening count; related actions must not be added without resolving population overlap.
2,100 total (US 1,300; CS 800)arnold-cwsac-battles, battle VA027; column casualties_text · snapshot
952b5d08402a…responsibility
supportedunresolved Both frozen Union commanders, Kearny and Stevens, were killed; Ropes says Stevens's division fell back and Kearny was killed reconnoitering in front of his troops.
The listed commanders' deaths changed command during the action; no automatic sole credit to any listed commander.
Union generals Stevens and Kearny were both killed.nps-va027-v1, Description · snapshot
9f3b5d7b662b…Stevens' division fell back, and Stevens, an excellent officer, was killed.ropes-northern-virginia-selections-v1, p.150 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…while reconnoitering in front of his troopsropes-northern-virginia-selections-v1, p.150 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…strength
unknownunresolved
No inspected return establishes matched personnel at a common opening boundary. The frozen side-specific numerical strength bounds are blank (missing_numeric_strength). No figure in this pass is adopted as a simultaneous opening force.
supportedunresolved The frozen force field says Divisions; the live field reads zero. NPS says Jackson attacked two Union divisions under Kearny and Stevens; Ropes says the brunt fell on Reno's divisions and Kearny's, and that Longstreet had not arrived.
Formation descriptions without counts; live zeros are not measured absence.
Jackson sent his divisions against two Union divisions under Kearny and Stevensnps-va027-v1, Description · snapshot
9f3b5d7b662b…The brunt of the battle was borne by Reno's divisions, and Kearny's division of Heintzelman's corps.ropes-northern-virginia-selections-v1, p.150 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…was over before he arrived.ropes-northern-virginia-selections-v1, p.148 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…terrain
supportedunresolved NPS describes a severe thunderstorm; Ropes says it was nearly dark and raining heavily, with woods and difficult country behind Jackson's line.
Weather and ground description; no map verification or numerical effect.
it was nearly dark, and came on to rain very heavily.ropes-northern-virginia-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…In the rear of the cross road were woods and difficult country.ropes-northern-virginia-selections-v1, p.149 (OCR page markers; not checked against print) · snapshot
0aab4f25cad9…Open questions
- Returns and casualty categories remain deferred. Ropes reports no Federal loss of guns or prisoners at Chantilly (Appendix D) but gives no casualty figure.
- NPS/CWSAC is one family; Ropes is one retrospective history written from the Federal standpoint by a civilian author. Reports and despatches quoted inside Ropes are not additional independently inspected families.
- No automatic commander attribution, causal campaign score, morale/readiness number or battle/campaign double counting.