Mezue ahịrịokwu na-esonụ: A kpọbatara ndị agha ahụ n'ọrụ gọọmenti etiti na July 12, 1861, ma hapụ maka isi agha, na-abata n'akụkụ Potomac na August 25. N'Ọktoba 21, ọ na-etinye aka na ọnwụ kachasị njọ n'etiti ndị agha Federal niile na Agha nke Ball's Bluff. N'oge opupu ihe ubi nke 1862, e mere ya akụkụ nke II Corps nke ndị agha nke Potomac ma soro ya n'oge Mgbasa Ozi Peninsular, na-etinye aka na agha nke
Seven Pines, Savage's Station, na Glendale nwere obere mfu. N'ọnwa Eprel afọ 1862, e kenyere ndị otu 1st Company Massachusetts Sharpshooters na ndị agha ahụ, na-eje ozi na ya ruo oge opupu ihe ubi nke afọ 1863. N'ịbụ nke nọrọ ihe ka ukwuu n'oge okpomọkụ ahụ na Harrison's Landing, ọ hapụrụ n'August n'oge iji hapụ Agha nke Abụọ nke Bull Run. Mgbe ahụ ndị agha ahụ malitere na Maryland Campaign, ebe ndị Confederates gbara ya gburugburu na Agha Antietam, na-efunahụ ihe karịrị 50% nke ndị ikom 600 ya. N'oge Agha Fredericksburg, a na-eme ka ọ pụọ na isi ọgụ na Marye's Heights ma nwee obere mfu. Agha nke Gettysburg hụrụ ndị agha ahụ ka ha na-alụ ọgụ megide mwakpo ndị agha Northern Virginia na July 2 na 3, 1863, na nnukwu mfu. Ka ọ na-erule afọ 1864, ike nke ndị agha ahụ belatara, mana ọ ka na-eche ọgụ siri ike ihu na ọgụ na The Battle of the Wilderness, Spotsylvania, Cold Harbor, na Siege of Petersburg. Ka ọ na-erule na June 22, ndị agha ahụ nwere ike itinye ndị isi na ndị agha 75 naanị. E jidere obere ìgwè a n'ụbọchị ahụ mgbe ndị agha Confederate gbara ha gburugburu na Jerusalem Plank Road. Ndị lanarịrịnụ na ndị a tọhapụrụ n'ọrụ gọọmenti etiti na July 26, 1864, na ndị ọhụrụ ya na ndị na-edebanye aha ọzọ na-agafe na 20th Massachusetts Volunteer Infantry.