Tallarn: Witness is the twenty-third short story published in the Horus Heresy Series that was not originally part of an anthology novel. Tallarn: Witness was first published within the event programme for the Horus Heresy Weekender 2015, and later released as an e-book.
After a somewhat unexpected Imperial victory against the Iron Warriors upon the dead wastes of Tallarn, the world's new Governor-Militant Susada Syn takes to the battlefield. With the wreckage of a million tanks and war machines spread across the planetary surface, Syn and his allies in the Space Marine Legions and Imperial Army survey the carnage, and consider the price that they have paid in blood...
The following is the chronological order of the Tallarn Series story arc set within the Horus Heresy:
- Black Oculus
- Tallarn: Siren
- Tallarn: Executioner
- Tallarn: Ironclad
- The Eagle's Talon
- Iron Corpses
- Tallarn: Witness
The Tallarn Series begins shortly after book twenty-three, Angel Exterminatus.
- Tallarn: Witness (Short Story) by John French