Jomini and the classical tradition in military thought.--Waterloo.--Wellington and the British army.--William I and the reform of the Prussian Army.--Lord Haldane and the Territorial Army.--Reflections on the First World War.--Hitler and his generals.--The Mediterranean in British strategy in the Second World War.--Bombing and the bomb.--The classical strategists.--Strategy and policy in twentieth-century warfare.--Military power and international order.--Disarmament and the military balance.--Problems of a disarmed world.--Morality and force in international politics.--Epilogue: the invasion of Czechoslovakia.