Rubuta ci gaba don wannan sakin layi - Bayan janyewa daga gaban Richmond, Rundunar III ta bi Sojojin Potomac zuwa Manassas, inda aka aika don karfafa sojojin John Pope na Virginia. Rundunar ta bar Harrison's Bar a ranar 14 ga watan Agusta, kuma, ta yi tafiya zuwa Yorktown, ta shiga ranar 20 ga watan Agusta don Alexandria. Ya isa Warrenton Junction a ranar 26 ga watan Agusta, kuma a rana mai zuwa Brigade Excelsior ya yi gwagwarmaya a tashar Bristoe. Ranar 29 ga watan Agusta, an yi amfani da jikin a Groveton. Cuvier Grover's Brigade, na Hooker's Division, ya yi yaƙi sosai a tashar jirgin kasa, wanda aka yi amfani da bayonnets da muskets da aka yi amfani da su. A ranar 1 ga watan Satumba, Kearny's Division ya shiga cikin Chantilly
, Birney's Brigade yana da muhimmiyar rawa; An kashe Kearny a wannan aikin. Asarar da aka yi a Manassas, ciki har da Bristoe, Groveton, da Chantilly, sun kai 260 da aka kashe, 1,525 da suka ji rauni, kuma 453 sun rasa; duka, 2,238, ciki har da Phil Kearny, wanda sojojin Confederate suka kashe a Chantilly. Hooker's Division ya ƙidaya mutane 10,000 a Yorktown, kuma ya sami ƙarfafawa game da 3,000; bayan Manassas, ya zana rations a Fairfax Station don mutane 2,400 kawai.