Pursuant to the scheme concerted, the Bœotians and Chalkidians attacked Attica at the same time that Kleomenês entered it. The former seized Œnoê and Hysiæ, the frontier demes of Attica on the side towards Platæa, while the latter assailed the north-eastern frontier, which faces Eubœa. Invaded on three sides, the Athenians were in serious danger, and were compelled to concentrate all their forces at Eleusis against Kleomenês, leaving the Bœotians and Chalkidians unopposed. But the unexpected breaking up of the invading army from Peloponnesus proved their rescue, and enabled them to turn the whole of their attention to the other frontier. They marched into Bœotia to the strait called Euripus, which separates it from Eubœa, intending to prevent the junction of the Bœotians and Chalkidians, and to attack the latter first apart. But the arrival of the Bœotians caused an alteration in their scheme; they attacked the Bœotians first, and gained a victory of the most complete character,—killing a large number, and capturing seven hundred prisoners. On the very same day they crossed over to Eubœa, attacked the Chalkidians, and gained another victory so decisive that it at once terminated the war. Many Chalkidians were taken, as well as Bœotians, and conveyed in chains to Athens, where after a certain detention they were at last ransomed for two minæ per man; and the tenth of the sum thus raised was employed in the fabrication of a chariot and four horses in bronze, which was placed in the acropolis to commemorate the victory. Herodotus saw this trophy when he was at Athens. He saw too, what was a still more speaking trophy, the actual chains in which the prisoners had been fettered, exhibiting in their appearance the damage undergone when the acropolis was burnt by Xerxês: an inscription of four lines described the offerings and recorded the victory out of which they had sprung.[299] [299] Herodot. v, 77; Ælian, V. H. vi, 1; Pausan. i, 28, 2.