"Under Siege (Regnum Irae)" is Sepultura's third single, as well as the third of three to be released from the album Arise. No music video was produced for the song.

This article does not cite any sources. (June 2019)

"Under Siege (Regnum Irae)"
Single by Sepultura
from the album Arise
B-side	"Orgasmatron" (Motörhead cover) "Troops of Doom" (new version)
Released	1991
Recorded	1990–1991 at Morrisound Recording in Tampa, Florida
Genre	Thrash metal death metal
Length	4:53
Label	Roadrunner
Songwriter(s)	Max Cavalera Igor Cavalera Andreas Kisser Paulo Jr.
Producer(s)	Scott Burns
Sepultura singles chronology
"Dead Embryonic Cells" (1991) "Under Siege (Regnum Irae)" (1991) "Refuse/Resist" (1993)

At this stage in their career the band had recorded little material to be used as B-sides, which is why the Arise singles are so similar. This single and the previous one ("Dead Embryonic Cells") have exactly the same artwork (a detail of the Arise album cover artwork by Michael Whelan) and B-sides.

Track listing

1. "Under Siege (Regnum Irae)" (album version)
2. "Orgasmatron" (Motörhead cover)
3. "Troops of Doom" (This is the re-recorded version of the song which originally appeared on the album Morbid Visions.)

Personnel

• Max Cavalera – lead vocals, rhythm guitar
• Igor Cavalera – drums
• Andreas Kisser – lead guitar
• Paulo Jr. – bass
• Produced by Scott Burns and Sepultura
• Recorded and engineered by Scott Burns
• Mixed by Andy Wallace
• Assistant engineers: Fletcher McClean and Steve Sisco