1980 Liege-Bastonge-Liege aka Neige-Bastogne-Neige. The year it snowed. And that hard man rode away to an 80 km solo victory.
https://www.velonews.com/news/bernard-hinault-breaks-down-his-historic-win-at-liege-bastogne-liege/
There is also the brilliant advice from his DS, Cyril Guimard. I won't give it away!