 Nyorai kupfuurira kweiyi ndima - Pakangotanga Hondo Yenyika Yose, Matthies akabva angozvipira kupinda muU.S. Army. Musi waMay 14, 1861 akava kaputeni mu1st Iowa Volunteer Infantry. Nokukurumidza pashure pacho musi waJuly 23, 1861 akagadzwa kuva lieutenant colonel we5th Iowa Volunteer Infantry. Matthies akatanga kurwa paHondo yeChitsuwa Nhamba Gumi. Akagadzwa kuva mukuru wemauto musi waMay 23, 1862 uye akarwa muhondo dzeIukaneKorinde. Munguva yechando ya1862-1863 akanga ari mutungamiri weboka muuto reTennessee. 