De Facto the Matter
From Halopedia, the Halo wiki
Template:Infobox song De Facto The Matter is a track from the Halo Wars: Original Soundtrack.
This song will play during gameplay whenever you command your units to attack an enemy base, and was also used in the Halo Wars E3 2007 Trailer, which featured the original version of the game.
This song's name is a play on words of the phrase "The fact of the matter".