On the Mysteries (107)

Later the Great King invaded Greece. As soon as our fathers saw what an ordeal faced them and what vast forces the King was assembling, they decreed that exiles should be restored and disfranchised citizens reinstated, that these too should take their part in the perilous struggle for deliverance. After passing this decree, and exchanging solemn pledges and oaths, they fearlessly took up their stand as the protectors of the whole of Greece, and met the Persians at Marathon; for they felt that their own valour was itself a match for the enemy hordes. They fought, and they conquered. They gave back Greece her freedom, and they delivered Attica, the land of their birth.