World War I casualties
The total number of military and civilian casualties in World War I were about 40 million: estimates range from 15 to 19 million deaths and about 23 million wounded military personnel, ranking it among the deadliest conflicts in human history.
History of the United Kingdom during the First World War
The civilian death rate exceeded the prewar level by 292,000, which included 109,000 deaths due to food shortages and 183,577 from Spanish Flu. The 1922 War Office report detailed the deaths of 1,260 civilians and 310 military personnel due to air and sea bombardment the home islands. Losses at sea were 908 civilians and 63 fisherman killed by U-boat attacks.