Through the Sky They Soar! The 1000 Year Legend Lives Again!

Synopsis

Luffy talks to Ryuuji in his final moments and comes to understand just what is going on. The flock of dragons returns just as Lost Island (which was really Battleship Island) begins to re-surface. An angered Luffy uses them to launch an attack that destroys Nelson's flagship. The resurfacing Lost Island destroys the rest of the Marine ships, which were still chained together. (Source: Wikipedia) East Blue saga: Warship Island arc: (7/8)