Kammala jumla mai zuwa: Komawa zuwa Algeria, an ba da lasisi ga rundunar a ranar 14 ga Disamba, 1861, ta hanyar dokar Imperial. An canja mazajen zuwa na biyu na kasashen waje wanda ya canza sunan sunan a ranar 1 ga Janairu, 1862, ya zama Rundunar Kasashen waje. A lokacin binciken na Mexico daga 1861 zuwa 1867, rukunin kasashen waje sun shiga Mexico inda na karshen ya isa ranar 25 ga Maris, 1863 a Veracruz. Kamfanin na 3 na yaƙi ya nuna kansa tare da bambanci yayin da yake sadaukar da kansa a lokacin
Yaƙin Camarón () a ranar 30 ga Afrilu, 1863. Rundunar ta 1 da ta 2 sun halarci kewaye da Oaxaca wanda ya mika wuya a watan Afrilu na shekara ta 1865. Rundunar ta 2 ta rasa ran 1 ga Maris, 1866, an kashe mutane 102 a lokacin yakin Santa Isabel. A ranar 13 ga Disamba na wannan shekarar, rundunar ta bar Mexico. A lokacin Yaƙin Franco-Prussian (1914), Legion ya shiga rikici cikin jinkiri. Ya kasance a ƙarshen Satumba 1870, cewa rukunin ya haɗu da 15th Crops 1st Brigade, 2nd Division kuma an same shi yana tafiya zuwa Orléans (inda rundunar ta ƙi sau 3 a jere umarnin komawa baya kuma inda Lieutenant Kara, Peter I na Serbia ya nuna iyawa) a watan Oktoba da Disamba 1870 sannan a Montbéliard a watan Janairun 1871, inda ya tilasta wa Jamusawa barin garin.