Rubuta ci gaba ga wannan sakin layi - Eaton ya nemi shiga sansanin horar da jami'ai a Plattsburgh, New York a farkon 1917 kuma an ba shi izini a matsayin na biyu. Ya yi tafiya zuwa Faransa tare da 26th "Yankee" Division, 103rd Infantry Regiment. Da farko ya yi aiki a matsayin jami'in samar da kayayyaki tare da kuma daga bisani ya zama babban jami'in soja. Rukuninsa da rundunarsa sun ga aikin a Chateau Thierry, Belleau Woods Yaƙin Belleau Wood
,, Saint-Mihiel da kuma a cikin Argonne.