One Piece Episode: 473

, titled " The Encircling Walls Activated! The Whitebeard Pirates Backed into a Corner!! ," is a pivotal chapter in the Marineford Arc that showcases the Marines' strategic brilliance and the devastating power of Admiral Akainu. Key Plot Points

: The Marines activate giant, iron "Encircling Walls" designed to trap the Whitebeard Pirates within the frozen bay, cutting off their path to Ace’s execution platform.

: The walls fail to rise in one specific spot—the area where the massive body of Little Oars Jr. lies. His blood has seeped into the machinery, jamming the system and leaving a narrow opening for the pirates.