The ensuing Battle of Salamis was one of the decisive engagements of history. Themistocles trapped the Persians in a channel too narrow for them to bring their greater numbers to bear, and attacked them vigorously, in the end causing the loss of 200 Persian ships vs 40 Greek. Aeschylus wrote a play about the defeat, "The Persians", which was performed in a Greek theatre competition a few years after the battle. It is the oldest known surviving play. At the end, Xerxes still had a fleet stronger than the Greeks, but withdrew anyway, and after losing at Plataea in the following year, returned to Asia Minor, leaving the Greeks their freedom. Nevertheless, the Athenians and Spartans attacked and burned the laid-up Persian fleet at Mycale, and freed many of the Ionian towns. These battles involved triremes or biremes as the standard fighting platform, and the focus of the battle was to ram the opponent's vessel using the boat's reinforced prow. The opponent would try to maneuver and avoid contact, or alternately rush all the marines to the side about to be hit, thus tilting the boat. When the ram had withdrawn and the marines dispersed, the hole would now be above the waterline and not a critical injury to the ship.