Episode 709 - The Great Battle for the Sea! Luffy vs. the Navy’s Greatest Commanders

Episode 709
The Great Battle for the Sea! Luffy vs. the Navy’s Greatest Commanders
Japanese: 海のための大戦！ルフィVS海軍の最強司令官
Umi no Tame no Daisen! Rufi VS Kaigun no Saikyō Shireikan

The crew succeeds in preventing the weapon from causing widespread destruction, but not before facing off against the island’s strongest defenders. As they continue to uncover the secrets of the ancient weapon, the Straw Hat Pirates learn that the weapon is part of a larger puzzle that holds the key to the ultimate power in the world. The crew must make a difficult decision regarding its fate.