Kammala jumla mai zuwa: Hanneken ya fara aikinsa a matsayin mutum mai rijista, Hanneken ya yi aiki a cikin Banana Wars na 1910s da 1920s. A lokacin da
A lokacin da Amurka ta mamaye Haiti, ya kashe shugaban adawa Charlemagne Péralte, wanda aka ba shi lambar girmamawa. Daga baya, an ba Hanneken wani kwamiti, ya yi aiki a Haiti na wasu watanni kuma an ba shi lambar yabo ta Navy don kashe wani shugaban 'yan tawaye. Ya karbi Gicciye na Navy na biyu don ayyukansa a lokacin mamayar Nicaragua a ƙarshen 1920s.