Kammala jumla mai zuwa: Carmichael-Smyth ya koma Indiya a 1810 a matsayin kyaftin, kuma ya yi aiki a cikin
Mamayewar Java a shekara ta 1811. Bayan haka ya koma Bengal kuma ya tafi Callinger a matsayin injiniyan filin inda aka ambace shi a cikin sakonni don ƙarfin hali a 1812. Daga baya an tura shi a kan binciken kafin a zaɓe shi don taimakawa a yaƙin neman zaɓe a kan Alwar. Bayan kamfen din ya koma matsayinsa na injiniyan sansanin soja a Agra inda zai kasance har zuwa 1819. A lokacin Yaƙin Anglo-Nepalese tsakanin 1814 da 1816 ya yi aiki a duk ayyukan karkashin Sir David Ochterlony. A watan Fabrairun 1817 ya taimaka wajen rage Hathras. A wannan shekarar ya shiga rundunar Lord Hastings a Yaƙin Anglo-Maratha na Uku. A ranar 13 ga Maris 1817 a Cawnpore ya auri Anne Thackeray, gwauruwar Richmond Thackeray, kuma ya zama mahaifin mahaifin William Makepeace Thackeray. Ya koma Ingila a 1820 kuma an daukaka shi zuwa Major a 1821.