The Battle of Edd War (エッド・ウォーの海戦 Eddo Wō no Kaisen?, literally meaning "Sea Battle of Edd War") was a clash within the seas known as the Edd War between the Roger Pirates and the Golden Lion Pirates twenty-seven years before the current storyline, and three years before Gol D. Roger was executed by the Marines.
Roger and his crew went against Shiki's armada, with Shiki offering to join forces with Roger, as Roger found an Ancient Weapon via reading the Poneglyphs, and with their partnership, they could rule the entire world. Roger refused, due to his lack of interest in world domination. As the two crews clashed, it seemed inevitable that the Roger Pirates would lose due to Shiki's heavy fleet, but as fate would have it, a storm suddenly hit the seas that the two were fighting in, and half of the Golden Pirates' fleet was sunk. Shiki himself got a steering wheel stuck deep in his head accidentally from the battle, with no chance of removing it without killing Shiki. Despite this, the Pirate King had earned the Flying Pirate's respect.
On the sidelines, Fleet Admiral Kong had received a report about this battle and sent Admiral Sengoku to handle it with Vice Admiral Monkey D. Garp tagging along, though they did not make it in time, as the battle had already ended because of the storm.