This is Death Metal. Bolt Thrower writes almost exclusively about the topic of War. The introduction riff is a recurrent riff that runs across several song and albums.
@@everysongsucks You should check out the song World Eater. The recurrent riff began with the outro of that song. There is a cool video on here that is put together with a bunch of images from Warhammer 40K. Bolt Thrower got permission from Games Workshop to use their artwork because the whole Realm of Chaos record is themed in the 40K Universe, which is a Galaxy at war. Just search World Eater 40K tribute.