The technological advances in the machinery of space, nuclear and air warfare have obscured the importance of naval power. Using examples from Ancient Greece to the Gulf War, Gray argues that control of the sea is vital to strategic planning. The book shows how the various ways in which sea-power can be used to decisively influence the outcome of general conflicts. Sparta required a fleet to bring about the destruction of the Athenian Empire, the lack of access to the sea was a fatal weakness for Germany in both World Wars, whilst in the Gulf War, the ability of the western powers and their allies to bring up vast amounts of armour and supplies unchallenged was a key factor in the outcome of the war.