While the Athenians thus gave renewed proofs of their steadfast attachment to the cause of Hellas, they at the same time sent envoys, conjointly with Megara and Platæa, to remonstrate with the Spartans on their backwardness and breach of faith, and to invoke them even thus late to come forth at once and meet Mardonius in Attica: not omitting to intimate, that if they were thus deserted, it would become imperatively necessary for them, against their will, to make terms with the enemy. So careless, however, were the Spartan ephors respecting Attica and the Megarid, that they postponed giving an answer to these envoys for ten successive days, while in the mean time they pressed with all their efforts the completion of the isthmic fortifications. And after having thus amused the envoys as long as they could, they would have dismissed them at last with a negative answer,—such was their fear of adventuring beyond the Isthmus,—had not a Tegean, named Chileos, whom they much esteemed, and to whom they communicated the application, reminded them that no fortifications at the Isthmus would suffice for the defence of Peloponnesus, if the Athenians became allied with Mardonius, and thus laid the peninsula open by sea. The strong opinion of this respected Tegean, proved to the ephors that their selfish policy would not be seconded by their chief Peloponnesian allies, and brought to their attention, probably for the first time, that danger by sea might again be renewed, though the Persian fleet had been beaten in the preceding year, and was now at a distance from Greece. It changed their resolution, not less completely than suddenly; and they despatched forthwith in the night five thousand Spartan citizens to the Isthmus,—each man with seven Helots attached to him. And when the Athenian envoys, ignorant of this sudden change of policy, came on the next day to give peremptory notice that Athens would no longer endure such treacherous betrayal, but would forthwith take measures for her own security and separate pacification,—the ephors affirmed on their oath that the troops were already on their march, and were probably by this time out of the Spartan territory.[312] Considering that this step was an expiation, imperfect, tardy, and reluctant, for foregoing desertion and breach of promise,—the ephors may probably have thought that the mystery of the night-march, and the sudden communication of it as an actual fact to the envoys, in the way of reply, would impress more emphatically the minds of the latter,—who returned with the welcome tidings to Salamis, and prepared their countrymen for speedy action. Five thousand Spartan citizens, each with seven light-armed Helots as attendants, were thus on their march to the theatre of war. Throughout the whole course of Grecian history, we never hear of any number of Spartan citizens at all approaching to five thousand being put on foreign service at the same time.