Kammala jumla mai zuwa: Dallas ya yi aiki a cikin Yakin Crimean daga 1853 <unk> 56, yana ganin aikin a
Alma, Balaclava, Inkerman da kuma Siege na Sevastopol. A lokacin yakin ya sayi mukamin kyaftin a watan Satumba na 1854, tare da yin aiki a matsayin "mai taimakawa" ga Janar Garrett. Ya rubuta shaidar gani da ido game da yaƙin, ya ƙunshi wasiƙu 127. An sanya shi memba na Dokar Medjidie, 5th Class, ta Daular Ottoman a watan Maris na 1858. Daga bisani ya sayi babban jami'in a watan Oktoba na 1862, kafin a ci gaba da shi a matsayin mai kula da jami'in a watan Janairu na 1868. Ya yi ritaya daga aiki a watan Maris na shekara ta 1875. Dallas ya mutu a Huddersfield a watan Fabrairun 1888.