Battle of Cyzicus
| Battle of Cyzicus | |||||||||
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| Part of the Peloponnesian War | |||||||||
 A Greek trireme |
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| Belligerents | |||||||||
| Athens |
Sparta Persia |
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| Commanders and leaders | |||||||||
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Alcibiades Thrasybulus Theramenes Chaereas |
Mindarus † Hippokrates, Clearchus Hermocrates Pharnabazus |
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| Strength | |||||||||
| 86 triremes | 80 triremes | ||||||||
| Casualties and losses | |||||||||
| Minimal | Entire fleet | ||||||||
The naval Battle of Cyzicus took place in 410 BC during the Peloponnesian War. In the battle, an Athenian fleet commanded by Alcibiades, Thrasybulus, and Theramenes routed and completely destroyed a Spartan fleet commanded by Mindarus. The victory allowed Athens to recover control over a number of cities in the Hellespont over the next year. In the wake of their defeat, the Spartans made a peace offer, which the Athenians rejected.
In the wake of the Athenian victory at Abydos in November 411 BC, the Spartan admiral Mindarus sent to Sparta for reinforcements and began working with the Persian satrap Pharnabazus to plan for a new offensive. The Athenians, meanwhile, were unable to follow through on their victory, since the depletion of the Athenian treasury precluded any major operations. Thus, by the spring of 410 BC, Mindarus had built a fleet of eighty ships, and with the support of Pharnabazus's troops, besieged and took the city of Cyzicus. The Athenian fleet in the Hellespont withdrew from its base at Sestos to Cardia to avoid the superior Spartan force, and ships under Alcibiades, Theramenes, Thrasybulus that had been dispatched to raise money combined with this force, creating a fleet of 86 ships. This fleet, along with a force of land troops under Chaereas, set out to the Hellespont to challenge Mindarus.
The Athenian force entered the Hellespont, and, passing the Spartan base at Abydos by night so as to conceal their numbers, established a base on the island of Proconnesus (modern-day Marmara), just northwest of Cyzicus. The next day, they disembarked Chaereas's force near Cyzicus. The Athenian fleet then divided, with 20 ships under Alcibiades advancing towards Cyzicus while two other divisions under Thrasybulus and Theramenes lurked behind. Mindarus, seeing an opportunity to attack what appeared to be a vastly inferior force, set out towards them with his entire force. Alcibiades's force fled, and Mindarus's ships gave chase. When both forces had gotten well out from the harbor, however, Alcibiades turned to face Mindarus, and Thrasybulus and Theramenes appeared with their forces to cut off his retreat. Mindarus, seeing the trap, fled in the one open direction, towards a beach south of the city, where Pharnabazus was located with his troops. The Spartan fleet suffered losses in the flight, and reached the shore with the Athenians right behind them.
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