In 2006, while playing at the ProgPower USA festival, Mercenary covered Pantera's 'Cowboys From Hell' at the request of the show's promoter.

In 1991 when Kral and Andreas were forming the band, they heard a song of Slayer called "Ghosts of War" that contained lyrics featuring the words "Fallen Mercenary" and decided to take Mercenary as their band name. They also used to paint as soldiers but stopped when it got too difficult to get painted before the show and to remove the paint after the show.