Mezue ahịrịokwu na-esonụ: Mgbe Thompson rutesịrị France na February 1918, e kenyere ya ọrụ n'ụlọ ọrụ ndị ọrụ Nnyocha (G-2) nke isi ụlọ ọrụ ndị agha American Expeditionary Force. Site na Julaị ruo Septemba 1918, Thompson bụ osote onye isi ndị ọrụ maka ọgụgụ isi na ndị ọrụ nke United States Army mbụ. Ọ sonyere na ma nke
Mwakpo Aisne-Marne na Agha nke Saint-Mihiel. Site na Septemba 1918 ruo Eprel 1919, Thompson jere ozi dị ka G-2 maka ndị agha nke abụọ nke United States, nke gụnyere ọrụ agha nke mpaghara Toul. E buliri ya n'ọkwa lieutenant colonel na October 1918.