Athenian victory at Rhium demonstrated the tactical advantage of superior seamanship over larger but less maneuverable Peloponnesian forces in the Gulf of Patras.
Key Facts
- Year
- 429 BC
- Peloponnesian fleet size
- 47 triremes
- Ships captured by Athens
- 12
- Athenian commander
- Phormio
- Strategic objective
- Peloponnesian crossing to attack Acarnania
By the Numbers
Location
Cause → Event → Consequence
The Peloponnesian fleet of 47 triremes attempted to cross the Gulf of Patras to reach the northern shore and attack Acarnania, supporting an offensive in northwestern Greece. Many of their vessels were equipped as transports rather than warships, limiting their combat effectiveness before the engagement began.
Athenian commander Phormio intercepted the Peloponnesian fleet mid-crossing and used superior seamanship to encircle the enemy ships. The Peloponnesians adopted a defensive circular formation, but Athenian vessels gradually forced them closer together until the ships fouled oars and collided. The Athenians then attacked suddenly, routing the Peloponnesian fleet.
The Athenians captured 12 Peloponnesian ships and decisively repelled the attempted crossing to Acarnania. The battle reinforced Athenian naval dominance in the Gulf of Patras and frustrated Peloponnesian ambitions in northwestern Greece during this phase of the Peloponnesian War.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Phormio.
Side B
1 belligerent