Feuer frei is the fifth track of the album Mutter. "Feuer Frei" is the "Fire" command in the German military. It literally means "fire freely", but the closest equivalent in English would be "fire at will" or "open fire". Feuer frei is one of the band's better known songs thanks to the band's appearance in the 2002 movie xXx.
The UK Feuer Frei single was released in three parts (2xCD, 1xDVD), in three different colors (Yellow-Green-Orange), each with different track listings.