Changes

| 998.M41 An infantry unit assigned to the 4621st Imperial Army, X corps during the Taros Campaign. {{Fn|3a}} The regiment had the honour of being the first on the ground after the Space Marines of the [[Raptors (Chapter)|Raptors Chapter]] had destroyed the planets orbital defence facilities. The campaign ultimately ended in failure. The regiment was completely destroyed during the retreat from Tarokeen. Scattered and captured by the Tau, the survivors of the regiment were condemned to work in the mines for the greater good. Those few survivors who made it to the evacuation ships were reassigned to the Tallarn 331st Desert Raiders Regiment.{{Fn|3}} Also includes a [[Thunderer Siege Tank]] as part of the second, squadron of the second company.{{Fn|2e}}

Known to have taken part in the [[Annukani Campaign]] in [[M39]].{{Fn|1-p30}} Also one of the infantry units assigned to the 4621st Imperial Army, X corps during the Taros Campaign 998.M41. {{Fn|3a}} The campaign ended in failure. The regiment was completely destroyed during the retreat from Tarokeen. Scattered and captured by the Tau, the survivors of the regiment were condemned to work in the mines for the greater good. Those few survivors who made it to the evacuation ships were reassigned to the 331st Tallarn Desert Raiders Regiment, a green regiment which completed the campaign relatively unscathed.{{Fn|3}}

|A green infantry unit assigned to the 4621st Imperial Army, X corps during the Taros Campaign 998.M41. {{Fn|3a}} The campaign ended in failure. The regiment fared quite well in the retreat from the Imperial capital of Tarokeen. It fell back in good order and was extracted mostly intact. After the conflict the 331st received the survivors of the 17th Tallarn and the 89th Tallarn Desert Raiders regiments as reinforcements. Both of these having been completely destroyed in the campaign.{{Fn|3}}

Named also '''"Tallarn 3rd Tank Regiment"'''{{Fn|13}}. A veteran Armoured unit Assigned to the 4621st Imperial Army X corps during the Taros Campaign 998.M41. {{Fn|3a}} The campaign ended in failure. The regiment was effectively destroyed having lost all of their combat vehicles and much of their equipment during the retreat. The Tallarn 3rd Armoured Regiment would be reconstituted in the aftermath with the survivors of the 3rd Tallarn Armoured and the 12th Tallarn Armoured Regiment.{{Fn|3}} During the defence of Balle Alpha, [[Chimeras]] of [[Gryphonne IV]] design with [[heavy bolters]] were used.{{Fn|2h}}

|The Tallarn 12th Armoured Regiment are a veteran armoured unit assigned to the 4621st Imperial Army, X corps during the Taros Campaign 998.M41. {{Fn|3a}} The campaign ended in failure. The regiment was effectively destroyed having lost all of their combat vehicles and much of their equipment during the retreat. The survivors would be folded into the 3rd Tallarn Armoured Regiment.{{Fn|3}}'''