that the Megarians had cultivated the sacred land consecrated to Demeter and had given refuge to runaway slaves, a behavior which the Athenians considered to be impious. After consultations with its allies, Sparta sent a deputation to Athens demanding certain concessions, such as the immediate expulsion of the Alcmaeonidae family including Pericles and the retraction of the Megarian Decree, threatening war if the demands were not met. The obvious purpose of these proposals was the instigation of a confrontation between Pericles and the people; this event, indeed, would come about a few years later. At that time, the Athenians unhesitatingly followed Pericles' instructions. In the first legendary oration Thucydides puts in his mouth, Pericles advised the Athenians not to yield to their opponents' demands, since they were militarily stronger. Pericles was not prepared to make unilateral concessions, believing that "if Athens conceded on that issue, then Sparta was sure to come up with further demands". Consequently, Pericles asked the Spartans to offer a quid pro quo. In exchange for retracting the Megarian Decree, the Athenians demanded from Sparta to abandon their practice of periodic expulsion of foreigners from their territory (xenelasia) and to recognize the autonomy of its allied cities, a request implying that Sparta's hegemony was also ruthless. The terms were rejected by the Spartans, and with neither side willing to back down, the two cities prepared for war. According to Athanasios G. Platias and Constantinos Koliopoulos, professors of strategic studies and international politics, "rather than to submit to coercive demands, Pericles chose war". Another consideration that may well have influenced Pericles' stance was the concern that revolts in the empire might spread if Athens showed itself weak. First year of the war (431 BC) In 431 BC, while peace already was precarious, Archidamus II, Sparta's king, sent a new delegation to Athens, demanding that the Athenians submit to Sparta's demands. This deputation was not allowed to enter Athens, as Pericles had already passed a resolution according to which no Spartan deputation would be welcomed if the Spartans had previously initiated any hostile military actions. The Spartan army was at this time gathered at Corinth, and, citing this as a hostile action, the Athenians refused to admit their emissaries. With his last attempt at negotiation thus declined, Archidamus invaded Attica, but found no Athenians there; Pericles, aware that Sparta's strategy would be to invade and ravage Athenian territory, had