Colonel (later General) Greiss was in command of the Imperial Guard Catachan II Regiment, which was involved in the pacification of Balur. The campaign lasted for four years and he was severely wounded on several occasions.
Greiss was eventually succeeded by his former subordinate, "Iron Hand" Straken, taking up his new position as a General of the Imperium. In his new postition as General, Griess orchestrated the Imperial Guard's assault during the Dulma'lin Cleansing, personally selecting his former regiment to undertake the mission of sabotaging the Ork war effort. He was one of the few survivors of the ill-fated journey of the Selvian Dragoons, which saw them ambushed and slaughtered by the Orks, leaving the Catachan II stranded within Dulma'lin's capitol.
- 1: Codex: Imperial Guard (5th Edition), pg. 60
- 2: Codex: Imperial Guard (2nd Edition), pg. 86
- 3: Codex: Imperial Guard (3rd Edition, 1st Codex), pg. 25
- 4: Straken (Novel)