Intellectual eminence apart, what did Kant, Clausewitz, Marx and Engels, and Tolstoy have in common? Professor Gallic argues that they made contributions to 'international theory' - to the understanding of the character and causes of war and of the possibility of peace between nations - which were of unrivalled originality in their own times and remain of undiminished importance in ours. But these contributions have been either ignored or much misunderstood...