Kammala jumla mai zuwa: De Horsey ya shiga Royal Navy a 1840 kuma ya yi aiki a bakin tekun Siriya a ƙarshen wannan shekarar. Ya sami lambar yabo ta Janar na Janar da kuma bar don hidimarsa a Siriya da kuma lambar yabo don hidimarsa a Acre da Sultan na Daular Ottoman ya bayar. An ba shi mukamin Laftanar a watan Yulin 1846 kuma zuwa Kwamandan a watan Yunin 1853, an ba shi umarnin jirgin ruwa mai suna " Devastation " a wannan watan kuma na HMS " Victor " daga Nuwamba 1855. Ya zama Kyaftin a watan Satumba na 1857, ya umurci HMS "Brisk" daga Mayu 1859, HMS "Wolverine" daga Mayu 1864, HMS "Aurora" daga Nuwamba 1865 da HMS "Hector" daga Mayu 1868. Ya kasance Babban Jami'in a kan Lakes na Kanada a lokacin
Fenian raids; don wannan an ba shi lambar yabo ta Kanada. A cikin 1871 an sanya shi ADC ga Sarauniya Victoria. A watan Yulin 1872, bayan da aka daukaka shi zuwa Commodore, ya zama Babban Jami'in Sojan Ruwa a Jamaica tare da tutar sa a HMS "Aboukir" kuma yana da alhakin kula da Jamaica Dockyard. Ya kama dan bautar Spain "Manuela", kuma ya dakile tarzoma a Jamaica wanda aka gode masa a Majalisar.