 Nyorai kupfuurira kwendima iyi - Muna 1838, akatungamirira nzvimbo yokudzidzisa vatasvi vamabhiza paCarlisle Barracks muPennsylvania. Akagoverwa kuFt. Atkinson, Iowa Territory, kubva muna 1842 kusvikira muna 1845. Akanga ari mutungamiriri wenhare yacho mukati menguva iyoyo yakawanda. Akakwidziridzwa kuva mukuru we2nd Dragoons musi waJune 30, 1846. Munguva yehondo yeMexico neAmerica, Sumner akapihwa patent yekushinga muhondo yeCerro Gordo kune lieutenant colonel. Ikoko ndiko kwaakawana zita remadunhurirwa rokuti Bull Head nemhaka yenyaya pamusoro pebhora remusket rakanga raputika mumusoro make mukati mehondo. PaMolino del Reyakagamuchira chinzvimbo chepamusoro-soro chechikoronel. Akasimudzirwa kuva lieutenant colonel we1st US Dragoons musi waJuly 23, 1848. Akashanda semutongi wemauto weNew Mexico Territory kubva muna 1851 kusvika muna 1853 uye akasimudzirwa kuva colonel we1st U.S. Cavalry musi waMarch 3, 1855. 