Dueling went into sharp decline after World War I, following the wartime deaths of many members of the classes that practiced it, and the social changes following the war's mass carnage. After World War II, dueling went out of use in Europe except for rare exceptions. Training for a duel, once almost mandatory for males of aristocratic backgrounds, all but disappeared, along with the classes themselves. Fencing continued as a sport like boxing or karate, with tournaments and championships. However, the need to prepare for a duel with "sharps" all but vanished.