Whakaotihia te rerenga e whai ake nei: I te pakarutanga o te Pakanga o Mexico-Amerika i te Pipiri 1846, i whakahoutia a Van Buren ki te ope taua hei kaitiaki moni me te taumata o te rangatira. I mahi a Van Buren hei kaiawhina mo nga rangatira a Zachary Taylor me Winfield Scott, i uru ki te Pakanga o Contreras, Pakanga o Monterrey,
Te whakapae o Veracruz, te Pakanga o Cerro Gordo, me te Pakanga o Churubusco.