Rubuta ci gaba don wannan sakin layi - Da barkewar Yaƙin Duniya na I a watan Agusta 1914, an ba Krueger matsayi a matsayin mai sa ido tare da Sojojin Jamus amma an tilasta masa ya ƙi shi saboda alkawurran dangi. Maimakon haka, an tura shi zuwa 10th Infantry na Pennsylvania Army National Guard. An tattara rukunin a ranar 23 ga Yuni 1916 kuma ya yi aiki tare da iyakar Mexico na tsawon watanni biyar a matsayin wani ɓangare na Ƙungiyar Ƙungiyar Ƙasar Mexico.
a karkashin Manjo Janar John J. Pershing, ko da yake babu wani na rundunar tsaron kasa da ya yi yaƙi da sojojin Mexico. An tattara rukunin a watan Oktoba 1916.