History of the Peloponnesian War

These causes, the great losses from Decelea, and the other heavy charges that fell upon them, produced their financial embarrassment; and it was at this time that they imposed upon their subjects, instead of the tribute, the tax of a twentieth upon all imports and exports by sea, which they thought would bring them in more money; their expenditure being now not the same as at first, but having grown with the war while their revenues decayed.

Accordingly, not wishing to incur expense in their present want of money, they sent back at once the Thracians who came too late for Demosthenes, under the conduct of Diitrephes, who was instructed, as they were to pass through the Euripus, to make use of them if possible in the voyage along shore to injure the enemy.

Diitrephes first landed them at Tanagra and hastily snatched some booty; he then sailed across the Eurious in the evening from Chalcis in Euboea and disembarking in Boeotia led them against Mycalessus.