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.
Jagdstaffel 1
Among the 18 aces in the World War I ranks were Hans von Keudell, Kurt Wintgens, balloon buster Hans von Freden, Gustav Leffers, Walter Höhndorf, and Leopold Reimann. The squadron's casualties for the war were twelve killed in action, one killed in a flying accident, four wounded in action, and one captured.