Kammala wannan jumla: Mahon ya koma aikin soja. Ya yi aiki a cikin dakarun da dama, sau da yawa a cikin matsayi na girmamawa. A Uruguay an nada shi janar a cikin sojojin gwamnati a lokacin
Yakin basasa na Uruguay. Ya kuma yi iƙirarin cewa ya umurci rundunar jiragen ruwa ta Chile a lokacin Yaƙin tsibirin Chincha kuma ya yi aiki a matsayin colonel a cikin sojojin Pedro II na Brazil. Tarihi na baya ya yi da'awar cewa an naɗa shi babban bishop sa'ad da yake Brazil.