Whakaotihia te rerenga e whai ake nei: I te tomokanga mai o Amerika ki te Pakanga Tuatahi o te Ao, ka whakawhiti a Hayward ki te mahi kaha i roto i te kaitiaki o te motu hei koronel o te Infantry. I te mea he ope i waatea ki a ia, ka whakauruhia e ia, ka whakangungu, ka whakakakahu i te 15th New York Infantry, he ope rangatahi pango katoa. I muri mai ka tapaina te reimana ko te Harlem Hellfighters. I tae mai te ope taua ki Uropi i te puna o te tau 1917. Ko Pershing, i mahi a Hayward hei kaiako, i whawhai te ope ki nga French i raro i te tohu 369th Infantry Regiment. I whawhai rātau i te aroaro mō ngā rā 191, he roa ake i ētahi atu hōia o Amerika, ā, i uru rātau ki Champagne-Marne,
Ko Aisne-Marne, ko Meuse-Argonne. I whakawhiwhia a Hayward ki te "Croix de Guerre" me te nikau koura me te whetu hiriwa me te Tohu Ratonga Motuhake, i whakamoemitihia e Marshal Foch me General Pershing, a i whakawhiwhia ia hei rangatira o te Legion of Honor na te taunakitanga a General Petain. I whakauruhia ia me te toenga o te ope taua i te Poutu-te-rangi 1919.