The Battle of Sestus was a military encounter between the forces of Athens under General Helmetrus, and the King of Thrace and is nations army. The battle was a consequence of Thracian hostility, and the eventual invasion of Athenian territory in the peninsula of Chersonese. The Athenian army, despite engaging on foreign territory, was able to defeat the Thracian armies over the course of a single day, forcing the King to sue for peace.