History of the Peloponnesian War

It would be difficult for any system of fortifications to establish a rival city, even in time of peace, much more, surely, in an enemy's country, with Athens just as much fortified against it, as it against Athens;

while a mere post might be able to do some harm to the country by incursions and by the facilities which it would afford for desertion, but can never prevent our sailing into their country and raising fortifications there, and making reprisals with our powerful fleet.

For our naval skill is of more use to us for service on land, than their military skill for service at sea.

Familiarity with the sea they will not find an easy acquisition.