The aggressive sentiment, partly fear and partly hatred, was on the side of the Peloponnesians, who were not ignorant that Athens desired the continuance of peace, but were resolved not to let her stand as she was at the conclusion of the Thirty Years’ Truce. It was their purpose to attack her and break down her empire, as dangerous, wrongful, and anti-Hellenic. The war was thus partly a contest of principle, involving the popular proclamation of the right of every Grecian state to autonomy, against Athens: partly a contest of power, wherein Spartan and Corinthian ambition was not less conspicuous, and far more aggressive in the beginning than Athenian.
[431 B.C.]
Conformably to what is here said, the first blow of the war was struck, not by Athens, but against her. After the decisive answer given to the Spartan envoys, taken in conjunction with the previous proceedings, and the preparations actually going on, among the Peloponnesian confederacy, the truce could hardly be said to be in force, though there was no formal proclamation of rupture.
A few weeks undoubtedly passed in restricted and mistrustful intercourse; though individuals who passed the borders did not think it necessary to take a herald with them, as in time of actual war. Had the excess of ambition been on the side of Athens compared with her enemies, this was the time for her to strike the first blow, carrying with it of course greater probability of success, before their preparations were completed. But she remained strictly within the limits of the truce, while the disastrous series of mutual aggressions, destined to tear in pieces the entrails of Hellas, was opened by her enemy and her neighbour.
The little town of Platæa, still hallowed by the memorable victory over the Persians as well as by the tutelary consecration received from Pausanias, was the scene of this unforeseen enterprise which marks the opening of hostilities in the Peloponnesian war.[b]
Greek Helmets
THE SURPRISE OF PLATÆA
War had been only threatened, not declared; and peaceful intercourse, though not wholly free from distrust, was still kept up between the subjects of the two confederacies. But early in the following spring, 431 B.C., in the fifteenth year of the Thirty Years’ Truce, an event took place which closed all prospects of peace, precipitated the commencement of war, embittered the animosity of the contending parties, and prepared some of the most tragical scenes of the ensuing history. In the dead of night the city of Platæa was surprised by a body of three hundred Thebans, commanded by two of the great officers called Bœotarchs. They had been invited by a Platæan named Nauclides, and others of the same party, who hoped with the aid of the Thebans to rid themselves of their political opponents, and to break off the relation in which their city was standing to Athens, and transfer its alliance to Thebes. The Thebans, foreseeing that a general war was fast approaching, felt the less scruple in strengthening themselves by this acquisition, while it might be made with little cost and risk. The gates were unguarded, as in time of peace, and one of them was secretly opened to the invaders, who advanced without interruption into the marketplace. Their Platæan friends wished to lead them at once to the houses of their adversaries, and to glut their hatred by a massacre. But the Thebans were more anxious to secure the possession of the city, and feared to provoke resistance by an act of violence. Having therefore halted in the marketplace, they made a proclamation inviting all who were willing that Platæa should become again, as it had been in former times, a member of the Bœotian body, to join them.