Kammala wannan jumla: Garland ya shiga rundunar Winfield Scott kuma, a karo na biyu a cikin aikinsa, yana aiki a ƙarƙashin William Worth, wanda yanzu shine kwamandan sashinsa. Garland ya yi yaƙi a yaƙe-yaƙe na
Veracruz, Yaƙin Cerro Gordo, Contreras da Churubusco. Domin ayyukansa masu daraja a cikin yaƙe-yaƙe biyu na ƙarshe, an nada shi brigadier janar na yau da kullun. Ya jagoranci tawagarsa a yakin Molino del Rey da kuma kai hari kan Chapultepec. Ya tsira daga yaƙin har zuwa yanzu ba tare da wata mummunar rauni ba, amma lokacin da ya yi tafiya tare da tawagarsa zuwa Mexico City da aka faɗi, wani mai harbi mai kaifi na Mexico ya buge shi a kirji kuma ya ji rauni sosai.