Battle of Aegospotami
The Battle of Aegospotami in 405 B.C. was part of the Second Peloponnesian War between the Greek city states of Athens and Sparta and their allies. It was near the very end of the war, although neither side knew it at that time.
The Spartan general Lysander, put back in command after the drowning death of Callicratidas at the Battle of Arginusae, struck the Athenian fleet while they were moored at night with most of the crews ashore. The Athenian fleet of nearly 200 vessels was completely destroyed. Most of the crews were then captured and slaughtered. It proved to be the pivotal battle of what had been a long see-saw war as Athens was unable to recover.
Encyclopedia of Military History, Dupuy & Dupuy, 1979