=53.= By the death of the Spartan three hundred, the gates of Greece were thrown open, and the hosts of Asia poured through, wasting the country with fire and sword. At Pano´peus a detachment was sent to plunder the temple of Apollo at Delphi, while Xerxes led his main army through Bœo´tia. On the march he received the submission of all the people except the Platæans and Thespians, who, rather than yield to an invader, abandoned their cities to be burnt. Before his arrival at Athens, the chief object of his revenge, the king heard of the total defeat of his Delphian expedition. According to Greek tradition, no mortal hand turned back the invaders, but Apollo himself hurled down great rocks and crags upon their heads, in the dark ravines of Parnassus, and thus defended his sanctuary. [Sidenote: B. C. 480.] =54.= Athens was a deserted city. All the fighting men were with the fleet, while women, children, and infirm persons had been removed to Salamis, Ægi´na, or Trœze´ne. The conqueror stormed the citadel, plundered and burnt the temples, and sent word to Susa that Athens had shared the fate of Sardis. =55.= Xerxes now resolved upon a decisive naval battle in the Saronic Gulf. The Grecian fleet had assembled off Salamis, to the number of 378 vessels, while the Persians numbered 1,200. A throne was erected on the mainland, upon the slope of Mount Ægaleos, from which the great king beheld the struggle which was to end his dreams of conquest. The Persian fleet occupied the channel between Salamis and the coast of Attica. Their vast numbers, crowded into so narrow a space, were a fatal disadvantage to themselves, for they could only come near the Greeks by small detachments; while the latter, more accustomed to those waters, drove their brazen-pointed prows into the sides of the Persians, advancing and retiring with wonderful dexterity and surety of aim. Feeling the eye of their king upon them, the Persians fought with desperate bravery. The battle lasted all day; when night fell, Xerxes saw his forces scattered or destroyed, and instead of renewing the battle, resolved to seek his own safety in retreat. =56.= Mardonius engaged to complete the conquest of Greece with 300,000 men. The fleet was ordered to the Hellespont, and the king with the remainder of his forces set out for home. His magazines had been exhausted, and during this forced retreat many died of hunger. Forty-five days after his departure from Attica he arrived at the Hellespont, and finding his second bridge of boats destroyed, returned to Asia by ship. He entered Sardis at the end of the year 480, humbled and depressed, only eight months from the time when he left it full of vain hopes of subduing the western world.