Rubuta ci gaba don wannan sakin layi - A lokacin Yakin Amurka da Mexico, ya yi yaƙi a yakin Contreras da yakin Churubusco
, duka biyu a watan Agusta 1847. Yayin da yake aiki a Churubusco ya sake ji rauni, kuma aikinsa a can tare da ayyukansa a Contreras ya ba shi izini ga babban jami'in a ranar 20 ga watan Agusta. Walker ya shiga cikin yakin Molino del Rey a farkon watan Satumba kuma ya sake rauni, wannan lokacin a baya. Domin ayyukansa a can an sanya shi a matsayin mai kula da jami'in a ranar 8 ga watan Satumba.