Mezue ahịrịokwu na-esonụ: Onye gụsịrị akwụkwọ na 1915 na Royal Military College, Sandhurst, Dempsey bụ onye e nyere ọrụ dịka onye isi nke abụọ na Royal Berkshire Regiment. Dịka onye isi ndị agha, ọ lụrụ ọgụ na Western Front n'oge Agha Worldwa Mbụ, ebe ọ merụrụ ahụ, ma nye ya Cross Cross. Mgbe agha biri, o jere ozi na Iraq n'oge
Nnupụisi Iraq nke 1920, Iran n'oge Agha Obodo Russia, na India.