Rubuta ci gaba don wannan sakin layi - Sojojin Scott sun isa kwarin Mexico a watan Agusta 1847, a lokacin Santa Anna ya kafa rundunar sojoji kimanin mutane 25,000. Saboda Mexico City ba shi da ganuwar kuma ba shi da kariya, Santa Anna ya nemi ya ci nasara da Scott a cikin yaƙi, ya zaɓi ya kafa kariya kusa da Kogin Churubusco, mai nisan kilomita da yawa kudu da birnin. An fara yakin Contreras a ranar 19 ga watan Agusta, lokacin da sojojin Mexico a karkashin Janar Gabriel Valencia suka kai farmaki da kuma turawa wani dan Amurka da aka ba da alhakin gina hanya. Da sanyin safiya na rana mai zuwa, sojojin Amurka da Janar Persifor Frazer Smith ya jagoranci sun ba da mamaki kuma sun hallaka sojojin Valencia. Labarin rashin nasarar da aka yi a Contreras ya haifar da tsoro a tsakanin sauran sojojin Santa Anna, kuma Scott nan da nan ya ci gaba da kai hari, ya fara yakin Churubusco
Ka yi haƙuri. Duk da tsaron da aka yi da Battalion Saint Patrick da wasu wasu raka'a, sojojin Scott sun yi nasara da sauri a kan sojojin Mexico da suka raunana. Bayan yakin, Santa Anna ya yi sulhu da Scott, kuma ministan harkokin wajen Mexico ya sanar da Trist cewa suna shirye su fara tattaunawa don kawo karshen yakin.