In their invasion of Attica the Persians had destroyed the city of Athens, and the people, who had fled to all quarters of the peninsula to seek refuge from the enemy, returned after the victory at Salamis and the flight of the Persians, to find their homes a heap of ruins. The dwelling-houses of the Greeks were everywhere, even in their largest cities, built of mean materials: walls of stubble overlaid with stucco and gayly painted. It was not long, therefore, before Athens resumed something of her old appearance, with such improvements as always follow the rebuilding of a city. The most important change effected was that brought about in the character of the great plateau, the fortified rock of the Acropolis. Here, as in many Greek cities, the temples of the gods had been erected, and about them, as about the cathedrals of the Middle Ages, there had grown up a swarm of houses and other buildings built by generations of people who sought there at once the protection of the stockade which enclosed the almost inaccessible site, and the still further safeguard of the presence of the divinities in their temples. The destructive hand of the Persian invaders had swept this platform clear of all these multiplied incumbrances, and in the rebuilding of the city it was determined to reserve the Acropolis for military and religious uses alone. The work of improvement was begun by Cimon, who, however, confined his attention chiefly to the lower city that clustered about the base of the Acropolis. Here, among other structures, he built the temple of Theseus and the Painted Portico, and he also erected, near the summit of the Acropolis, on the western side, the little gem-like temple of the Wingless Victory, Nike Apteros, in commemoration of the success of the Athenian arms at the battle of the Eurymedon. It was from Cimon that Phidias received his first commission for work upon the Acropolis, where later he was to build such a lasting monument to his own fame and to the fame of his native land. The commission given him by Cimon was to erect a bronze statue of Athena which was to stand on the citadel, at once a symbol of the power of Athens and a tribute to the protecting goddess of the city. The work upon the statue was probably begun under Cimon, but according to Ottfried Müller it was not completed at the death of Phidias. It stood in the open air, and nearly opposite the Colonnade at the entrance of the great flight of marble steps that led from the plain to the summit of the Acropolis, and was the first object to meet the eye on passing through the gateway. It represented the goddess, armed, and in a warlike attitude, from which it derived its name, Athena Promachos: Athena, the leader of the battle. With its pedestal it stood about seventy feet high, towering above the roof of the Parthenon, the gilded point of the brazen spear held by the goddess flashing back the sun to the ships as in approaching Athens they rounded the promontory of Sunium.