Kammala wannan jumla: Heath ya yi aiki a yakin duniya na farko tare da Mahratta na 110, yana ganin aikin a yakin Mesopotamiya. Ya shafe shekaru biyu da rabi a Mesopotamiya, inda aka ji masa rauni sau biyu kuma ya zama mara aiki saboda zafin rana a watan Agusta 1915, kuma kafin
Siege na Kut an nada shi gwamnan Qurna. An daukaka shi zuwa Manjo a watan Agusta 1915, kuma Masarautar Serbia ta ba shi lambar yabo ta Order of Karađorđe's Star, 4th Class (tare da takuba). A watan Yunin 1917, an sanya shi Lieutenant Colonel na wucin gadi yayin da yake jagorantar bataliya. Heath ya mutu a watan Yulin 1917 a Bagadaza sakamakon tasirin zafi. Ya tsira da matarsa, Pear St John Richardson, wanda ya yi aure a Poona a 1906, yana da ɗa ɗaya.