Qor sii wadida faqradan - Bishii Maarso 1847, Polk wuxuu ogaaday in Taylor uu iska indho tiray amarradii oo uu sii waday inuu koonfur u sii maro, isagoo qabsaday waqooyiga magaalada Mexico ee Saltillo. Ciidanka Taylor ayaa iska caabiyay ciidan badan oo reer Mexico ah, oo uu hogaaminayay Santa Anna, dagaalkii Buena Vista bishii Febraayo 1847. Taylor wuxuu ku guulaystay in uu ku guuleysto natiijada dagaalka, laakiin tiyaatarka ayaa ahaa mid aan dhammaystirnayn. Halkii uu ku raacsan lahaa ciidamada Santa Anna, Taylor wuxuu dib ugu noqday Monterrey. Waqtigaas Scott wuxuu degay Veracruz si deg deg ahna wuu uga adkaaday
Magaalada dhexdeeda. Kadib qabsashadii Veracruz, Polk wuxuu diray Nicholas Trist, oo ahaa madaxa xafiiska Buchanan, si uu heshiis nabadeed ula galo hoggaamiyeyaasha Mexico. Trist waxaa lagu amray inuu raadsado in la siiyo Alta California, New Mexico, iyo Baja California, aqoonsiga Rio Grande oo ah xadka koonfureed ee Texas, iyo marin u helka Mareykanka ee Isthmus of Tehuantepec.