 Nyorai kupfuurira kweiyi ndima - Fuller akaendeswa ku11th Field Artillery muna July 1917, uye akapinda kosi yekurairidzwa paFort Sill. Akakwidziridzwa kuva Major wenguva pfupi musi waJanuary 8, 1918. Akafamba nechikepe achienda kuFrance muna October 1918 uye akabatana ne108th Field Artillery paVéronnes. Akatora chikamu muMeuse-Argonne Offensive uye akatungamira 108th Field Artillery muHondo yeSambre, achiwana kukwidziridzwa kuti ave Mutungamiriri Mukuru wechinguvana musi waSeptember 11, 1918. Akatungamira 109th Field Artillery kusvika munaKurume 1919 uye akabva ashanda neMotor Transport Corps uye Graves Registration Service. 