=166.= The second Lacedæmonian foray was more destructive than the first, for the ravages extended over all Attica, even to the silver mines of Laurium. The fleet of the Peloponnesians destroyed the fisheries and commerce of Athens, and devastated the island of Zacynthus. During the following winter Potidæa surrendered, after a blockade of two years, and was occupied by a thousand Athenian colonists. [Sidenote: B. C. 429.] The third campaign of the Spartans was directed against Platæa. On the approach of Archidamus, the Platæans sent a solemn remonstrance, reminding him of the oath which Pausanias had sworn on the evening of their great battle, making Platæa forever sacred from invasion. The king replied that the Platæans, too, were bound by oath to labor for the independence of every Grecian state. He reminded them of their heinous crime in the slaughter of the Theban prisoners, but promised that, if they would abandon the cause of Athens and remain neutral during the war, their privileges should be respected. The Platæans refused to forsake their ancient ally, and the siege of their city began. [Sidenote: B. C. 429-427.] =167.= The garrison which thus defied the whole Peloponnesian army, consisted of only 480 men, but they made up in energy what they lacked in numbers. Archidamus began by shutting up every outlet of the town with a palisade of wood, then erected against this a mound of earth and stone, forming an inclined plane, up which his troops could march. The Platæans undermined the mound, which fell in, and thus defeated seventy days’ work of the whole besieging army. They also built a new wall within the old one, so that, if this were taken, the Spartans would still be no nearer the possession of the city. Seeing that the will of the Platæans could only be subdued by famine, the allies now turned the siege into a blockade. They surrounded the city with a double wall, and roofed the intervening space, so as to afford shelter to the soldiers on duty. The Platæans thus endured a complete separation from the outer world for two years. Provisions began to fail; and, in the second year, nearly half the garrison made their escape, by climbing over the barracks and fortifications of their besiegers in the rain and darkness of a December night. The Platæans, though thus reduced in numbers, came at length to absolute starvation. A herald now appeared from the Spartan commander, requiring their submission, but promising that only the guilty should be punished. They yielded. When brought before the five Spartan judges, every man was found guilty and led to execution. The town and territory of Platæa were made over to the Thebans, who destroyed all private dwellings, and with the materials erected a huge barrack, to afford shelter to visitors, and dwellings to the serfs who cultivated the land. The city of Platæa was blotted out from the map of Greece. [Sidenote: B. C. 429.]