Mezue ahịrịokwu na-esonụ: Na-emegharị ndị iro n'echi ya (Ọgọstụ 30), ndị 48th Pennsylvanians nwetara ọgụ siri ike karị n'oge
Agha nke Chantilly (September 1), n'oge nke 48th Pennsylvania nọkwa na aka nri nke ndị agha Union. E nyere iwu ka ọ gaa Alexandria mgbe agha ahụ gasịrị, e kenyere ndị agha ahụ ọrụ na Maryland Campaign (September 4<unk>20). Mgbe ha lụchara ọgụ ọzọ na nso Fox's Pass na agha nke South Mountain (September 14), Monaghan na 48th Pennsylvania nọgidesiri ike n'ọgba aghara nke Agha Antietam (September 17). Mgbe ha zutere ndị iro n'ụtụtụ ahụ na Burnside's Bridge, ha duziri 1st Brigade n'ịchụso ndị agha CSA site na Sharpsburg na ndị gbara ya gburugburu mgbe ha nọ n'okpuru nnukwu égbè ndị iro na égbè. N'ịga n'ihu na-agagharị ma na-alụ ọgụ mgbe ụfọdụ na onye iro ahụ dara ada, ha lụrụ ọgụ ọzọ na Agha Fredericksburg (December 11-15).