History of the Peloponnesian War
Thucydides
Thucydides, Vol. 1-4. Smith, Charles Foster, translator. London and Cambridge, MA: Heinemann and Harvard University Press, 1919-1923.
If any of the cities that have entered into this compact with the King shall go against the country of the King, the rest shall strive to prevent this and aid the King to the extent of their power; and if any of those who inhabit the King's territory or any territory over which the King has dominion shall go against the territory of the Lacedaemonians or of their allies, the King shall strive to prevent this and give aid to the extent of his power.”
After making this compact Therimenes turned over the command of the fleet to Astyochus and sailing away in a skiff was never seen again.[*](He was doubtless lost at sea. The word is used of unexplained disappearance in 4.80.4. Cf. also Xen. Hell., 1.6.38.)