What Chapter Does Luffy Use Conqueror's Haki In Marineford Page

In the climactic arc of the Marineford Summit War (chapters 550–580 of the One Piece manga), Monkey D. Luffy demonstrates his latent potential as a true leader by unconsciously unleashing Haoshoku Haki (Conqueror's Haki) . This moment is pivotal, as it separates him from ordinary pirates and marks him as someone with the disposition of a king.

If you are watching the anime, this corresponds to (near the end of the episode). what chapter does luffy use conqueror's haki in marineford