Dee ihe na-aga n'ihu na paragraf a - N'ụzọ dị mwute maka Sibert, mgbe United States banyere Agha Ụwa nke Mbụ n'April 1917, Brigadier General Sibert bụ otu n'ime ndị isi ndị isi ndị agha na-arụ ọrụ. 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, Ọchịagha John Joseph Pershing, onye ọrụ agha na-eje ozi ogologo oge a ma ama maka ọrụ ike 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 onwe ya ka akwalitechara n'ọkwa ya) yabụ etinye Sibert na-elekọta 1st Infantry Division.