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.
British cavalry during the First World War
Although the trench warfare on the Western Front was dominated by the artillery and infantry, the cavalry still suffered 5,674 dead and 14,630 other casualties. For comparison, one infantry regiment—the Northumberland Fusiliers—had 16,000 casualties. Unlike the huge losses in the infantry regiments, only ten cavalry regiments suffered over 200 dead. The 3rd Dragoon Guards, with 333 dead, had the most killed, while the 7th Hussars had eighty dead, one less than the 21st Lancers, which had remained in India throughout the war. The dead included one major general, eleven brigadier generals, but only twenty-eight of the 1,161 lieutenant colonels killed during the war were from the cavalry, several of those after having assumed command of an infantry battalion.