 Nyora kupfuurira kweiyi ndima - McKean akarayira paJefferson City, Missouri, kubva muna December kusvika kuna March 1862. Akabva apiwa basa rokutungamirira divi muuto reTennessee musi waApril 10. Akarwa muHondo yeKorindemuMississippi musi waOctober 34, uye ipapo akatungamirira boka rake kusvikira pana December 9. McKean akabva arayira matunhu akawanda mumatare akachengetwa neUnion muna 1863, 1864, uye kusvika muna Chikunguru 10, 1865. McKean akagadzwa pachigaro chebrevet major general musi wa13 Kurume nekuda kwebasa rake rehondo, uye akaburitswa mubasa rekuzvipira musi wa24 Nyamavhuvhu. 