Rubuta ci gaba don wannan sakin layi - Shekaru goma bayan haka, a cikin Yakin Mexico-Amurka (1846-1848), Marines sun yi sanannun hare-haren su a Fadar Chapultepec, wanda ya yi watsi da Mexico City, babban aikin farko na farko. Tun da yake tafiya zuwa Mexico City zai zama dogon aiki kuma wataƙila ba zai yiwu ba, rundunar haɗin gwiwa (da ke ɗauke da Sojojin Ruwa 200) a ƙarƙashin Manjo Janar Winfield Scott sun sauka
Kudancin Veracruz a ranar 9 ga Maris 1847 kuma ya kama birnin a ranar 29 ga Maris. Daga can, sun yi yaƙi zuwa Mexico City kuma suka fara kai hari a ranar 13 ga Satumba. An bai wa sojojin ruwa aikin share Castle Chapultepec, "Halls of Montezuma", inda suka yanke launuka na Mexico kuma suka gudu da Flag na Amurka. Babban yawan mace-mace a tsakanin jami'ai da jami'ai ba a ba da izini ba ne a cikin "jinin jini" na tufafi, da kuma layin "Daga Majami'un Montezuma" a cikin Marines 'Hymn. Daga baya aka sanya sojan ruwa a aikin tsaro a fadar kuma an sanya Kyaftin Jacob Zeilin, Kwamandan gaba, ya zama gwamnan soja. Marines kuma sun yi aiki a matsayin wani ɓangare na rundunar sojan ruwa na Mexico wanda ya samu nasarar hana makamai da makamai daga kasashen waje daga kaiwa sojojin Mexico, kuma a matsayin wani ɓangare na Battalion na California karkashin Major Archibald H. Gillespie; alkawurran sun hada da fadace-fadace na Monterey, Los Angeles, Dominguez Rancho, San Pasqual, Rio San Gabriel, La Mesa, da 2nd Tabasco. Sauran yaƙe-yaƙe sun haɗa da 1st, 2nd, & 3rd Tuxpan, kama La Paz, kare La Paz, Mulege, da kamawa da kare San José del Cabo.