British General Douglas Haig compared British attacks during the First World War to an Islamic martyrdom operation, citing a note written by Moslem Emperor Baber (1527) before sending his troops into battle: 

• The most High God has been propitious to us—that if we fall in the field, we die the death of martyrs; if we survive, we rise victorious the avengers of the cause of God.

This note, Haig said, "conveys the root matter of the present war." The suicidal attacks of British soldiers, he recognized, were no different than the suicidal acts of Islamic martyrs.

Summarizing British casualties on August 22, 1919, Haig noted that British casualties were “no larger than to be expected: killed, wounded, missing and prisoners were “approximately three million (3,076,388)." 

It's fair to characterize the behavior of British soldiers during the First World War as the greatest martyrdom operation in history.