Sacred War is the battle music of Ultima: Exodus (NES) and is heard in every instance of combat. Unfortunately, the song is pretty short and repetitive.
The title is translated from the Ultima Mix album (聖なる戦い, Seinaru Tatakai).
Ultima: Exodus (NES)
The NES song is the original version of the tune. The song is track 6 in the NSF file and is played on the RP2A03.
Ultima: Fear of Exodus (MSX2)
The song was ported to the MSX PSG which gives it a flatter sound. It is track $05 in the KSS file.