Kammala jumla mai zuwa: Battalion na Saint Patrick (, daga baya aka sake tsara shi a matsayin Foreign Legion of Patricios) wani rukuni ne na 175 zuwa ɗaruruwan (lissafi ya bambanta) baƙi da baƙi na asalin Turai waɗanda suka yi yaƙi a matsayin wani ɓangare na Sojojin Mexico da Amurka a cikin Yaƙin Mexico-Amurka na 1846-48. An kafa shi kuma John Riley ya jagoranci shi, membobin kungiyar sun hada da mutane da yawa da suka yi watsi da su ko kuma suka yi watsi da sojojin Amurka. Rundunar ta yi aiki a matsayin rukunin bindigogi don yawancin yakin. Duk da cewa daga baya an sanya shi a matsayin kamfanoni biyu na sojoji, har yanzu yana riƙe da bindigogi a duk lokacin rikici. A hanyoyi da yawa, rundunar ta zama kadai Mexican counterbalance ga sabon bidiyon Amurka na doki artillery. Sun kasance suna da alhakin manyan batutuwan da Amurka ta fuskanta a mamayewar Mexico, tare da Ulysses S. Grant yana cewa "
Churubusco ya kasance game da yaƙi mafi tsanani da aka yi a kwarin Mexico".