During World War II, Winston Churchill was forced to make a painful choice. The British secret service had broken the Nazi code and informed Churchill that the Germans were going to bomb Coventry. He had two alternatives:
(1) evacuate the citizens and save hundreds of lives at the expense of indicating to the Germans that the code was broken; or
(2) take no action, which would kill hundreds but keep the information flowing and possibly save many more lives. Churchill had to choose and followed the second course.