British Prime Minister Winston Churchill launched his campaign against Hitler on this day, July 19, 1941, in a historic speech before the House of Commons: "I expect that the Battle of Britain is about to begin. Upon this battle depends the survival of Christian civilization. ... The whole fury ... of the enemy must very soon be turned on us." Churchill concluded: "If we fail, then the whole world, including the United States ... will sink into the abyss of a new Dark Age made more sinister ... by the light of perverted science. Let us therefore ... so bear ourselves that ... men will ... say, 'This was their finest hour.'"