Kammala wannan jumla: Komawa zuwa Amurka a matsayin kwamandan kwamandan a Watertown Arsenal, ya sake tafiya zuwa Turai a ƙarshen 1914 a matsayin mai lura da soja na Amurka tare da Sojojin Jamus na watanni shida. Yanzu, mai kula da kwamandan kwamandan, ya sake daukar nauyin aikin tare da Kwamitin Gun Forgings daga Mayu 1915 har zuwa Yuni 1916. Bayan watanni takwas a matsayin jami'in sojan soja na Kudancin Kudancin lokacin da aka tattara sojojin dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun dakarun.
An kira shi zuwa Washington a ƙarshen Fabrairu 1917, don zama mataimakin shugaban kayan aiki. Tare da shigar Amurka cikin Yaƙin Duniya na I a watan Afrilu 1917, ya yi tafiya zuwa Faransa a matsayin babban jami'in sojan Amurka. Williams ya shafe watanni goma sha ɗaya a can, a lokacin da ya ci gaba da digiri biyu zuwa matsayin brigadier general.