History of the Peloponnesian War

A further circumstance which rendered it easier for them to procure an army from the Peloponnesus was the evil fortune which at the present time attended the Lacedaemonians.

For since the Athenians kept harassing the Peloponnesians, and especially the territory of the Lacedaemonians, the latter thought that the best way of diverting them would be to retaliate by sending an army against their allies, especially since these allies were ready to maintain an army and were calling upon the Lacedaemonians for help in order that they might revolt.

Furthermore, the Lacedaemonians were glad to have an excuse for sending out some of the Helots, in order to forestall their attempting a revolt at the present juncture when Pylos was in the possession of the enemy.