Mezue ahịrịokwu na-esonụ: N'ụzọ dị mwute maka Sibert, mgbe United States banyere Agha Ụwa Mbụ n'April 1917, Brigadier General Sibert bụ otu n'ime nanị ndị isi ndị agha na-eje ozi. E nyere ya ikike ka ọ bụrụ onye isi ndị ọchịagha ma tinye ya na ndị agha anọ mbụ nke American Expeditionary Force (AEF) nke mejupụtara Ngalaba 1st Infantry (nke a na-akpọ "The Big Red One") otu oge na France. Onyeisi ndị agha AEF, General John Joseph Pershing, onye ọrụ agha na-eje ozi ogologo oge ama ama maka ọrụ ya na
San Juan Hill na Spanish-American War, na nso nso a na-ahụ maka mkpọsa megide Pancho Villa, enweghị ndị isi n'ozuzu ya (ọ bụ naanị na nso nso a ka a kwalitere ya n'ọkwá ya) yabụ etinye Sibert na-elekọta 1st Infantry Division.