Dee ihe na-aga n'ihu maka paragraf a - Site na nkewa nke steeti iri na otu nke ndịda na ntiwapụ nke Agha Obodo, Miller sonyeere ndị agha Union. N'abalị iri abụọ na asaa n'ọnwa Ọgọstụ, afọ 1861, Gọvanọ Oliver P. Morton nyere Miller ọrụ dị ka Ọchịagha nke 29th Indiana Infantry. Mgbe ọzụzụ gasịrị, e kenyere ndị agha ahụ na Kirk's Brigade na ngalaba Alexander M. McCook na Buell's Army of the Ohio wee gaa Tennessee. Miller nọ n'ọgbọ agha n'ụbọchị nke abụọ nke Agha Shiloh
, nakwa n'oge nnọchibido nke Kọrịnt. Miller du ndị agha ya gafee ebe ugwu Alabama na Tennessee ma chụsoo Braxton Bragg gafee Kentucky. Miller duziri otu ndị agha n'okpuru James Negley n'oge Agha nke Osimiri Stones na ngwụcha Disemba 1862. N'ụbọchị nke abụọ nke agha ahụ, Miller duziri mwakpo ndị Federal gafere Osimiri Stones nke mere ka John C. Breckinridge's Confederate ọgụ. N'oge mwakpo a, e merụrụ Miller ahụ n'olu.