Rubuta ci gaba ga wannan sakin layi - An aika shi zuwa Texas, ya dauki umurnin wani bindiga wanda ya umurce shi a yakin Palo Alto da Resaca de la Palma. Ya karbi takardar shaidar zuwa colonel don wadannan fadace-fadace guda biyu. A yakin Monterrey, Janar William J. Worth ya sanya Childs a matsayin mai kula da wani rukuni mai kai hari wanda ya kunshi sojojin soja da bindigogi. Ya yi nasarar kai hari ga Fadar Bishop a ƙarshen yammacin birnin. An canja shi zuwa rundunar Winfield Scott tare da sauran sashin kuma ya kasance shugaban ma'aikatan Worth a lokacin Siege na Veracruz
Ka yi haƙuri. Bayan yakin Cerro Gordo Janar Scott ya nada Childs gwamnan soja na Jalapa kuma da zarar Scott ya koma cikin kwarin Mexico sai aka nada Childs gwamnan soja na Puebla. Ya rike wannan mukamin a lokacin yakin Mexico City. Ranar kafin Mexico City ta mika wuya, garuruwan Childs a Puebla sun shiga karkashin siege. A lokacin da aka kewaye Puebla, Childs ya ƙi mika wuya sau da yawa kuma ya sami nasarar kawar da hare-haren na Mexico har sai da taimakon taimako a karkashin Janar Joseph Lane ya isa kuma ya ci nasara da magoya bayan. Don kare garuruwan Childs ya zama brigadier janar.