Rubuta ci gaba ga wannan sakin layi - A watan Maris na shekara ta 1865, wakilan majalisar wakilai na Vermont sun ba da shawarar cewa Henry ya yi aiki a matsayin Marshal na Amurka don Vermont. An nada shi a watan Yulin 1865, kuma ya ci gaba da aiki har zuwa mutuwarsa. A lokacin mulkinsa, 'yan uwantaka na Fenian, kungiyar' yan Republican Irish, sun yi kokarin kai hari
mulkin Birtaniya na Kanada daga wuraren da aka shirya a Vermont. Henry ya ɗauki matakai don hana Fenians daga karɓar makamai ko tafiya zuwa Kanada, kuma daga baya ya kula da tarwatsawa da tashi daga jihar.