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.
Serbian Campaign of World War I
The Serb sources claim that the Kingdom of Serbia lost 1,100,000 inhabitants during the war. Of 4.5 million people, there were 275,000 military deaths and 450,000 among the ordinary citizenry. The civilian deaths were attributable mainly to food shortages and the effects of epidemics such as Spanish flu. In the addition to the military deaths, there were 133,148 wounded. According to the Yugoslav government in 1924, Serbia lost 365,164 soldiers, or 26% of all mobilized personnel, while France suffered 16.8%, Germany 15.4%, Russia 11.5%, and Italy 10.3%.