Operation: Eisenkrieg is the fifteenth mod by Sandy. Initially released as a demo on September 10, 2004 a final version was released three weeks later.
Still basing his mods on works by WSJ, this time Sandy used the then-recent Coming of the Storm as his main drive. Other sprites are taken from Castle Totenkopf v1.2, the then-recent wall packs and the ROTT guards made by MajikMonkee and posted on the Image World.
Brian Lowe provided the EXE which featured changed ceiling colors and the ability to get 110% health and 200 ammo. As such it is only playable in DOS.
This would prove to be Sandy's penultimate mod, having put out 15 mods over the course of roughly one year.