TOP 5 Greatest Wars in One Piece

#5 – PAYBACK WAR

The Payback War was a clash between the remnants of the Whitebeard Pirates and the Blackbeard Pirates about a year after the Battle of Marineford.
Led by First Division Commander Marco, the remainder of the Whitebeard Pirates sought revenge for the events that led up to and caused the Battle of Marineford. They had brought in their full forces in order to engage the Blackbeard Pirates, who responded in kind. However, the Whitebeard Pirates suffered an overwhelming defeat.

#4 – EDD WAR

Twenty seven years ago, two years before Gol D. Roger and his crew reached Raftel, Shiki had learned that the Pirate King had located an ancient weapon. Seeing the opportunity, he asked Roger if they could join forces. With his large pirate fleet and Roger’s weapon, Shiki believed that together they could take over the whole world and asked Roger to become his right hand. Roger however refused Shiki’s offer saying that there was no point in being a pirate if he could not do as he wished.
A great sea battle soon ensued between their crews at Edd War. Due to a storm that happened during their fight, Shiki unfortunately lost and half of his fleet sunk.

#3 – SUMMIT WAR OF MARINEFORD

The Battle of Marineford took place on the island of Marineford and the end results were that the Whitebeard Pirates failed to save Ace from death and lost their captain Edward “Whitebeard” Newgate, along with many other comrades.
This was the biggest gathering of Devil Fruit users so far in the series; with Akainu, Aokiji, Bartholomew Kuma, Blamenco, Boa Hancock, Buggy, Crocodile, Dalmatian, Daz Bones, Donquixote Doflamingo, Edward Newgate, Emporio Ivankov, Epoida, Galdino, Gekko Moriah, Hina, Inazuma, Jozu , Kizaru, Laffitte, Marco, Marshall D. Teach, Monkey D. Luffy, Onigumo, Portgas D. Ace, Sengoku, Smoker, Trafalgar Law, and Tsuru, as well as several unidentified Devil Fruit users, taking part, a total of at least twenty-seven people. Except for Enel, every canon Logia user created by Oda was present during the battle.

#2 – THE GREAT WAR DURING THE VOID CENTURY

The Void Century is a century-long gap in recorded and archaeological history, the study of which is forbidden by the World Government. These events occurred 900 to 800 years before the current storyline.
The most important event during the Void Century has to be the Great War. It ended around 722 with the fall of Shandora.
At the end of the Void Century, the 20 kingdoms came together to defeat the Ancient Kingdom and then founded what is now known as the World Government. The founding members pledged the equality between their kingdoms in front of the Empty Throne, with each kingdom leaving a weapon of their own next to the throne in order to symbolize its protection.

#1 – WANO ARC WAR

Recently, the Beasts Pirates have been occupying Wano Country and have taken over most of the country’s regions. One of the country’s daimyo, Kozuki Oden, was executed by Kaido and the resident shogun for refusing to give out information about the “True History” that he found out in his time as a member of the Roger Pirates. This caused Oden’s son, Kozuki Momonosuke, and three of his retainers, Kin’emon, Kanjuro and Raizo to flee the country towards Zou, where they could meet with two other retainers of the Mink Tribe, Inuarashi and Nekomamushi.
Kaido is planning something huge and we know what that thing is. War! But he’s not going to start just any war. He wants his war to be on such grandiose scale that it would be the greatest war the world has ever seen.
According to Oda, the War at Wano Country will be so huge that even Marineford will look “cute” compared to it!