Ka kammala wannan jumla: Abin takaici ga Sibert, lokacin da Amurka ta shiga yakin duniya na farko a watan Afrilu 1917, Brigadier Janar Sibert yana daya daga cikin manyan jami'an sojan da ke aiki. An ba shi izini a matsayin babban janar kuma an tura shi tare da rukunin farko na rundunar sojan Amurka (AEF) wanda ya kafa sashen sojan kasa na 1 (wanda ake kira "The Big Red One") sau ɗaya a Faransa. Kwamandan AEF, Janar John Joseph Pershing, wani jami'in sojan da ya dade yana aiki da ya shahara saboda ayyukansa a
San Juan Hill a cikin Yakin Mutanen Espanya-Amurka, kuma kwanan nan da ke kula da yakin da aka yi wa Pancho Villa, ba shi da cikakkun jami'ai (shi kansa kwanan nan ya ci gaba da matsayinsa) don haka aka sanya Sibert a matsayin mai kula da Ƙungiyar 1st Infantry.