|Battle of Cynossema|
|76 ships||86 ships|
|15 ships||21 ships|
The Peloponnesian ships were lined up with the Syracusans on the right wing, and the Spartans on the left. The Athenian line was formed with Thrasylus on the right and Thrasybulus on the left. In their attempts to outflank each other, the lines eventually extended to Cynossema. The Spartans were at first victorious, having pushed through the centre of the Athenian line. They assumed they had won the battle and began chasing individual Athenian ships, but Thrasybulus, ignoring the Syracusans for the moment, reorganized and soon routed the Spartan ships, which had moved out of formation. The Spartans retreated, and the Syracusans followed. The Athenians captured 21 ships, but the others were able to escape to Abydos. The Athenians lost 15 ships.
The victory prompted the oligarchy in Athens to be overthrown, and the democracy restored.