One of the things that I noticed in war was how difficult it was for our soldiers, at first, to realize that there are no rules to war. Our men were raised in sports, where a referee runs a football game, or an umpire a baseball game, and so forth.

Dwight David Eisenhower (1890-1969) American general, US President (1953-61)

Speech, Conference of the National Women’s Advisory Committee on Civil Defense (26 Oct 1954)