The battle for the city of Amphipolis, two years after the Athenian defeat at Delium, also went badly for Athens. This campaign occurred some 200 miles north of Athens in Thrace.
Amphipolis was strategic for Athens because Athens' gold mines, which were vital to her economy, were there. Amphipolis was captured by the enemy, so the inexperienced Athenian commander, Cleon, set out to retake it. The city was naturally defended on three sides by the Strymon River, requiring fortification only on the eastern side. Confronted with the heavy defenses, Cleon attempted a hasty retreat but was attacked from their unshielded side. The Athenians were defeated in the ensuing battle and Cleon was killed.
This was the second, then, of many battles which went badly for Athens as she gradually was defeated in the Peloponnesian War. Despite this, Socrates service in Potidaea, Delium and Amphipolis over a ten year period was exemplary!