History of the Peloponnesian War

For the Athenians being both with the sickness and their great expenses consumed and their navy divided, part upon your own coasts and part upon ours, it is not likely they should have many galleys to spare in case you again this summer invade them both by sea and land, but that they should either be unable to resist the invasion of your fleet or be forced to come off from both our coasts.

And let not any man conceive that you shall herein at your own danger defend the territory of another. For though Lesbos seem remote, the profit of it will be near you. For the war will not be, as a man would think, in Attica but there from whence cometh the profit to Attica.