Mezue ahịrịokwu a: Mgbe afọ abụọ gachara, na Jenụwarị 22, 1862, William H. Paul debara aha ya n'akwụkwọ ịga agha n'oge a na-alụ Agha Obodo na Filadelfịa, Pennsylvania. Mgbe ahụ, a kpọbatara ya na Camp McClellan na Philadelphia's Nicetown-Tioga agbata obi n'otu ụbọchị ahụ dị ka onye nkịtị na Company E nke 90th Pennsylvania Infantry. Ihe ndekọ ndị agha n'oge ahụ kọwara ya dịka onye bi na Filadelfia dị afọ iri abụọ, onye dị 5<unk> 3-1/2<unk> n'ogologo, nwere ntutu isi aja aja, anya hazel na akpụkpọ ahụ na-acha ọcha. Na ngwụcha ọnwa Machị, mgbe ọ gụsịrị ọzụzụ, e buuru ya na ndị agha ya n'ụgbọ okporo ígwè gaa Baltimore, Maryland, nke dị na Patterson Park Barracks, ma tinye ya n'ụgbọ agha dị larịị tupu ebugharị ya ọzọ, site na Washington, DC, gaa Aquia Creek Landing, ma kenye ya na ndị agha ya na Brigade nke abụọ, Ngalaba nke abụọ nke ndị agha US nke mbụ n'okpuru iwu nke General Irvin McDowell. N'ịgagharị na saịtị dị iche iche iji kwado ọrụ ndị agha Union maka ọnwa ole na ole sochirinụ, Paul na ndị ibe ya 90th Pennsylvanians hụrụ nnukwu ọrụ mbụ ha na Agha Cedar Mountain, Virginia (Ọgọstụ 9, 1862) n'oge mmalite nke Mgbasa Ozi Northern Virginia. E nyere ha iwu ka ha bibie àkwà mmiri ụgbọ okporo ígwè na ọdụ ụgbọ okporo ígwè Mitchell na August 15, ha na-esote na-eche ndị agha Union azụ ka ọ na-alaghachi azụ n'ofe Osimiri Rappahannock, wee nye nkwado na batrị ndị agha Union n'oge Agha Mbụ nke Rappahannock Station (August 22 <unk> August 25) tupu ịga n'ihu na arụmọrụ metụtara na Agha nke Thoroughfare Gap (August 28). Mgbe ọ lụchara ọgụ na Agha nke Abụọ nke Bull Run (Ọgọstụ 28-30) na
Agha nke Chantilly (September 1), e kenyere ha ọrụ ọzọ na Maryland Campaign n'okpuru Major-General Joseph Hooker, wee lụọ ọgụ ọzọ na Agha nke South Mountain (September 14).