Rubuta ci gaba ga wannan sakin layi - A lokacin da aka fara yakin Mexican-American a watan Yunin 1846, an sake sanya Van Buren a cikin rundunar soja a matsayin mai biyan kuɗi tare da babban majalisa. Van Buren ya yi aiki a matsayin mataimakin Janar Zachary Taylor da Winfield Scott kuma ya shiga cikin yakin Contreras, yakin Monterrey, Siege na Veracruz
, Yaƙin Cerro Gordo, da Yaƙin Churubusco.