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.
Economic history of World War I
The Commonwealth nations and India all played major roles. The Asian and African colonies provided large numbers of civilian workers, as well as some soldiers. The Indian Army during World War I contributed a large number of divisions and independent brigades to the European, Mediterranean and the Middle East theatres of war. Over one million Indian troops served overseas, of whom 62,000 died and another 67,000 were wounded.