The nuclear revolution, it is argued, caused an era of relative peace. Not all agree. Some suggest that nuclear weapons were actually irrelevant to keeping the peace because a world war had become too costly. ‘Nuclear deterrence and arms control’ considers both sides of the argument. Not until the second decade of the nuclear age was the danger of nuclear weaponry and the perception of this danger enough to give impetus to the concept of deterrence and cause a Cold War stalemate. Deterrence did not emerge as a military strategy, it was just a political reality. Nuclear stability prevailed due to good luck and mutual prudence.