In Western Europe and North America the idea that war can deliberately be used as an `instrument of policy' has become unfashionable, not least because of the carnage of two World Wars and the Americans' humiliating experience in Vietnam.
But wars are still fought. Those who start wars clearly believe they are worthwhile.
Why? In this original and provocative study, Brian Bond discusses the successes and failures of military and political leaders in their pursuit ofvictory over the last two centuries.
Professor Bond argues that in order to be counted victorious, a leader has to progress beyond military triumph to preserve the political control needed to secure an advantageous and enduring peace settlement.
Napoleon was a brilliant general, but failed as a statesman.
Bismarck, on the other hand, was a success in skilfully exploiting Moltke's victories on the battlefield to create a unified Germany.
In the First World War, Germany and her allies were defeated but at such great cost thatconfidence in the idea that war could be controlled, and the pursuit of victory made rational, received a terrible shock.
Germany and Japan exploited their military opportunites between 1939 and 1942, but lack of political control and moderation brought them catastrophic defeat.
After 1945, nuclear weaponsand the increased complexity of international relations blurred the identity of `victors' and `losers' and seemed to make the idea of a `decisive' victory almost unthinkable.
But this study warns against the assumption that war as an instrument of policy has now been completely discarded.
The Falklands and Gulf conflicts show that aggressors are still prepared to risk war for tangible goals, and that their opponents are quite capable of responding successfully to such challenges.