what episode marineford arc start

The Marineford Arc is the twenty-second story arc of the One Piece manga and anime series. The war at Marineford, between the Whitebeard Pirates and their allies against the entire Marine forces, including Seven Warlords of the Sea, started in episode 461 of the One Piece anime, titled ‘The Beginning of the War! Ace and Whitebeard’s Past!’ . The arc spanned 33 episodes and ran from episode 457 to 489. Therefore, the Marineford Arc starts at episode 461 of the One Piece anime.