When Xerxes, after the defeat of his fleet at Salamis, fled back to Asia with part of his disordered host, he left his lieutenant, Mardonius, with a still formidable army, to repair the disaster and accomplish, if possible, the conquest of the Greeks. Mardonius retired to Thessaly for the winter, but returned to Attica in the spring and drove the Athenians once more from their shattered city, which they were endeavoring to repair. He made overtures to them which they rejected with scorn, and thereupon he destroyed everything in city and country which could be destroyed, reducing Athens to ruins and Attica to a desert. The Spartans and other Peloponnesians who had promised support to the Athenians were slow in coming, but they came in strong force at last. Mardonius fell back into Bœotia, where he took up a favorable position in a plain on the left bank of the Asopus, near Platæa. This was in September, B. C. 479. According to Herodotus, he had 300,000 "barbarian" troops and 50,000 Greek allies. The opposing Greeks, who followed him to the Asopus, were 110,000 in number. The two armies watched one another for more than ten days, unwilling to offer battle because the omens were on both sides discouraging. At length the Greeks undertook a change of position and Mardonius, mistaking this for a movement of retreat, led his Persians on a run to attack them. It was a fatal mistake. The Spartans, who bore the brunt of the Persian assault, soon convinced the deluded Mardonius that they were not in flight, while the Athenians dealt roughly with his Theban allies. "The barbarians," says Herodotus, "many times seized hold of the Greek spears and brake them; for in boldness and warlike spirit the Persians were not a whit inferior to the Greeks; but they were without bucklers, untrained, and far below the enemy in respect of skill in arms. Sometimes singly, sometimes in bodies of ten, now fewer and now more in number, they dashed forward upon the Spartan ranks, and so perished. … After Mardonius fell, and the troops with him, which were the main strength of the army, perished, the remainder yielded to the Lacedæmonians and took to flight. Their light clothing and want of bucklers were of the greatest hurt to them: for they had to contend against men heavily armed, while they themselves were without any such defence." Artabazus, who was second in command of the Persians, and who had 40,000 immediately under him, did not strike a blow in the battle, but quitted the field as soon as he saw the turn events had taken, and led his men in a retreat which had no pause until they reached and crossed the Hellespont. Of the remainder of the 300,000 of Mardonius' host, only 3,000, according to Herodotus, outlived the battle. It was the end of the Persian invasions of Greece.