Whakaotihia te rerenga e whai ake nei: Ahakoa ko ia tonu i tata ki raro o tana akomanga, i puta a Maxey i te tau 1846 a ka whakawhiwhia ki a Brevet tuarua tuarua. I whakawhiwhia ia ki te 7th Infantry Regiment, i uru ki te Pakanga Mexico-American. I uru a Maxey ki te ope taua i Monterrey, Mexico. I whakahuatia a Maxey mo te maia me te rangatira tuatahi mo ana mahi i nga pakanga o Cerro Gordo me Contreras i te raumati o te tau 1847. I uru hoki ia ki ngā pakanga o
Ko Churubusco me te Molino del Rey. I whiwhi ia i te whakatipu rangatōpū, ā, i whakanohoia ia hei rangatira o tētahi kamupene pirihimana i Mexico City.