Rubuta ci gaba don wannan sakin layi - Hayes kuma ya yi aiki a cikin soja a cikin Yakin Spain-Amurka, Yakin Philippine-Amurka da Yaƙin Duniya na Farko. Ya kasance memba na Rundunar Cleveland ta Farko, daga baya aka sani da Troop A na Ohio National Guard. A lokacin Yakin Spain-Amurka, an nada shi babban jami'in a cikin Sojan doki na farko na Ohio. Ya yi yaƙi a Santiago de Cuba Campaign, a lokacin da aka ji masa rauni a lokacin tsallaka Kogin San Juan da kuma kai hari kan San Juan Hill
, kuma daga baya a cikin mamayewar Puerto Rico.