Ku qor sii wadida cutubkan - Hayes wuxuu sidoo kale ka soo shaqeeyay militariga Spanish-American War, Philippine-American War iyo Dagaalkii Koowaad ee Adduunka. Wuxuu xubin ka ahaa Kooxdii Koowaad ee Cleveland, oo markii dambe loo yaqaanay Kooxda A ee Ilaalada Qaranka ee Ohio. Intii lagu guda jiray dagaalkii Isbaanishka iyo Mareykanka, waxaa loo magacaabay major qeybta koowaad ee Ohio Cavalry. Wuxuu ku dagaalamay Santiago de Cuba Campaign, oo uu ku dhaawacmay intii lagu jiray ka gudbinta wabiga San Juan iyo weerarkii San Juan Hill
, ka dibna dagaalkii Puerto Rico.