Mezue ahịrịokwu na-esonụ: N'August 28<unk>30, 1862, ndị agha Confederate nke Northern Virginia nke General Robert E. Lee nyere iwu meriri ndị agha Union Major General John Pope nke Virginia na Agha nke Abụọ nke Bull Run ma ọ bụ nke Abụọ nke Manassas. Pope laghachiri na Centreville, Virginia ebe ọ tụlere inwe ike ya ịlaghachi na nchebe nke Washington, D.C. Ebe ọ bụ na ndị nwoke Pope laghachiri ma hazigharịa n'usoro dị mma, Major General Henry W. Halleck, mgbe ahụ bụ Union Army General-in-Chief, nyere Pope iwu ịwakpo Lee. Lee enyeghị iwu ka a chụsoo ndị agha Pope ozugbo n'ihi na ike gwụrụ ndị Confederates site n'izu atọ nke ịgagharị na agha ma ha enweghị mgbọ na ihe oriri. N'echi ya, Lee nyere Ọchịagha Thomas J. "Stonewall" Jackson iji merie ndị agha Union ma tinye ndị agha ya n'etiti ndị nwoke Pope na Washington, D.C. Nke a dugara na
Agha nke Chantilly ma ọ bụ Ox Hill na Fairfax County, Virginia na Septemba 1. Ngalaba ndị agha abụọ nke Union jidere ndị agha Confederate ka ajọ ifufe na-egbochi ọgụ na-aga n'ihu. Mgbe ọgụ ahụ kwụsịrị, ndị agha Union laghachiri na Jermantown, Virginia na Fairfax Court House, Virginia wee banye na Washington, D.C. Nke a meghere ụzọ maka Mgbasa Ozi Maryland, mbuso agha mbụ nke Lee n'Ebe Ugwu.