Pedzisa mutsara unotevera: Kunyange zvazvo aigara ari wechipiri pakirasi yake, Maxey akapedza kudzidza muna 1846 uye akapiwa chinzvimbo chokuva mukuru mukuru wechipiri. Akagoverwa ku7th Infantry Regiment, iyo yaibatanidzwa muMexico-American War. Maxey akabatana neboka racho muMonterrey, Mexico. Maxey akanzi akashinga uye akapihwa zita remutungamiri wehondo nokuda kwezviito zvake muhondo dzeCerro Gordo neContreras muzhizha ra1847. Akatorawo rutivi muhondo dze
Churubusco neMolino del Rey. Akakwidziridzwa pabasa uye akapiwa basa rokutungamirira mapurisa muMexico City.