Pedzisa mutsara unotevera: Eaton akakumbira kupinda muOfficers' Training Camp paPlattsburgh, New York mukuvamba kwa1917 uye akagadzwa somutevedzeri wechipiri. Akaenda kuFrance ne26th "Yankee" Division, 103rd Infantry Regiment. Pakutanga akashanda semukuru mukuru wezvokushandisa neUnited States Army uye akazokwidziridzwa kuva lieutenant wekutanga wevarwi. Chikamu chake nechikwata chake vakaona chiito paChateau Thierry, Belleau Woods
Hondo yeBelleau Wood,, Saint-Mihiel uye muArgonne.