Nyora kupfuurira kweiyi ndima - Mhuri yake yakatamira kuAmerica paakanga achiri mwana, achibatsirwa neHebrew Immigrant Aid Society. Akaenda kuchikoro muConnecticut, achipedza muna 1910. Panzvimbo pokufunda unyanzvi paYale University, Horwitz muduku neshamwari vakasarudza kuvhura chitoro chezvokudya muManhattan. Somutezo weNational Guard yeUnited States Horwitz akadanwa kuti ashande pasi paJohn J. Pershing kuti atore chikamu muPancho Villa Expedition
. Paakadzoka, akawana kuti bhizimisi rake rokutengesa zvokudya rakanga raparara. Horwitz akabva ashanda muHondo Yenyika I muFrance semusoja mukuru, uye somumwe wevarwi vaiva muArgonne.