420. Alcibiades negotiates an alliance between Athens and Argos. Amphipolis retained by the Spartans.
419. An Athenian expedition is led into the Peloponnesus by Alcibiades.
418. Victory of the Spartans at Mantinea.
The league between Athens and Argos dissolved.
416. The island of Melos, which had remained neutral, is conquered by the Athenians; its inhabitants are treated with extreme cruelty.
415. The Athenians send an expedition against Syracuse under Nicias, Lamachus, and Alcibiades; the latter is recalled to answer an accusation of having broken some statues of Mercury in Athens; he takes refuge in Sparta. Andocides, the orator, implicated in the same charge, is imprisoned and exiled.
414. Syracuse is invested by the Athenians under Nicias; being hard pressed, Syracuse appeals to the other Greek states; Cylippus, the Spartan commander, comes with a fleet to the aid of the city. See ["DEFEAT OF THE ATHENIANS AT SYRACUSE," ii, 48].
The Romans capture Bolae, an Æquian town; the division of the booty causes a mutiny among the soldiers, who slay the quaestor and the military tribune, M. Postumius.
413. On Alcibiades' advice the Spartans fortify a position at Decelea, in Attica.