Ku qor sii wadida cutubkan - Sanadkii 1911, intii uu ku sugnaa Fort Sam Houston, Texas, Hickam wuxuu qaatay tababar duulimaad marka lagu daro waajibaadkiisa caadiga ah ee loo xilsaaray. Bishii Janaayo 1914, waxaa loo wareejiyay 8th Cavalry, ka dibna Filibiin, isagoo yimid Xerada Stotsenberg bishii Diseembar 1913. Sannad ka dib waxaa loo dalacsiiyay inuu buuxiyo booska ugu horeeya ee Lieutenant ee 7th Cavalry, sidoo kale Camp Stotsenberg, wuxuuna ku soo laabtay 7th Cavalry ee Mareykanka bishii Diseembar 1915 ee Douglas, Arizona. Waxa uu ka soo shaqeeyay Mexico isagoo qayb ka ahaa Ciidanka Ciqaabta ee Mexico
Waxa uu dagaal ku galay March 19, 1916 ee Guerrero; April 22, ee Tomochic, Chihuahua, halkaas oo lagu abaalmariyay Xiddiga Lacagta ee ka dhanka ah Villistas oo uu hoggaaminayay Candelario Cervantes; iyo Piojo Canyon bishii Juun 20. Bishii Nofeembar 1916, Hickam wuxuu ka tagay 7th Cavalry si uu ugu adeego Professor of Military Science ee Jaamacadda Maine wuxuuna helay dalacsiinta kabtanka Cavalry, bishii Maajo 1917, ka dib markii Mareykanka uu galay Dagaalkii Koowaad ee Adduunka. Wuxuu ku biiray 18th Cavalry bishii Luulyo, laakiin cutubkan waxaa dib loogu magacaabay qoryaha duurka.