Payback War

The Payback War was a clash between the remnants of the Whitebeard Pirates — under Marco's leadership — and the Blackbeard Pirates about a year before the current storyline.

Details
The remainder of the Whitebeard Pirates sought revenge for the betrayal of Marshall D. Teach and the resulting deaths of Edward Newgate and Portgas D. Ace during 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 utter defeat.

Aftermath
After their defeat and failed revenge, the commanders of the Whitebeard Pirates commanders have disappeared, and have not been heard since. Marco's fate is left unknown as of late.

Teach's victory over the Whitebeard Pirates led the World Government to officially name him as one of the Yonko, specifically replacing Newgate. The rise of the new Yonko and the battle surrounding it became a global scale news.

Monkey D. Luffy, who was training on Rusukaina for the two years on roughly both sides of the War, was unaware of its happening, until he was told of it by his crew on Zou; this only intensified his animosity for Teach.