Ka kammala wannan magana: Sa'ad da yake matashi, Humphreys ya yi aikin koyan sana'a a wajen gina jirgi a Philadelphia, Pennsylvania. A lokacin da yake karatun, malamin sa ya mutu kuma an sanya shi a matsayin mai kula da ma'aikata. A lokacin Yakin Juyin Juya Halin Amurka ya kasance mai aiki a matsayin mai tsarawa, kuma ya taka muhimmiyar rawa wajen tsara jirgin ruwa mai bindigogi 32 kafin yakin basasa.
Rundunar sojojin Birtaniya ta Philadelphia ta dakatar da wannan kokarin.