Shanks and Mihawk have known about each other for years. Having fought multiple times and Shanks constantly trying to get him to join his crew, which Mihawk always declined.

Shanks and his crew were on an island. Drinking some booze and partying, the usual. Shanks was sitting on a log and drinking when he felt someone approaching. He looked over and grinned as he saw Mihawk.

"Dahahaha! Mihawk! Long time no see! Here to fight me? Or how about a drink?" He held out a mug of beer.