For some years before this time, the little state of Plataea in Boeotia, being hard pressed by her powerful neighbour, Thebes, had asked the protection of Athens, and had owed to an Athenian army the rescue of her independence. Now when it was noised over Greece that the Mede had come from the uttermost parts of the earth to destroy Athens, the brave Plataeans, unsolicited, marched with their whole force to assist in the defence, and to share the fortunes of their benefactors. The general levy of the Plataeans only amounted to a thousand men: and this little column, marching from their city along the southern ridge of Mount Cithaeron, and thence across the Attic territory, joined the Athenian forces above Marathon almost immediately before the battle. The reinforcement was numerically small; but the gallant spirit of the men who composed it must have made it of tenfold value to the Athenians: and its presence must have gone far to dispel the cheerless feeling of being deserted and friendless, which the delay of the Spartan succours was calculated to create among the Athenian ranks. This generous daring of their weak but true-hearted ally was never forgotten at Athens. The Plataeans were made the fellow-countrymen of the Athenians, except the right of exercising certain political functions; and from that time forth in the solemn sacrifices at Athens, the public prayers were offered up for a joint blessing from Heaven upon the Athenians, and the Plataeans also. [Mr. Grote observes (vol. iv. p. 484), that "this volunteer march of the whole Plataean force to Marathon is one of the most affecting incidents of all Grecian history." In truth, the whole career of Plataea, and the friendship, strong even unto death, between her and Athens, form one of the most affecting episodes in the history of antiquity. In the Peloponnesian War the Plataeans again were true to the Athenians against all risks and all calculation of self-interest; and the destruction of Plataea was the consequence. There are few nobler passages in the classics than the speech in which the Plataean prisoners of war, after the memorable siege of their city, justify before their Spartan executioners their loyal adherence to Athens. (See Thucydides, lib. iii. secs. 53-60.)]