John French
Tallarn
part 45

The Iron Warriors came from nowhere, falling upon the world of Tallarn in a flash and devastating it with deadly virus weapons. A verdant world was transformed in a heartbeat into a radioactive wasteland... but that was only the beginning.
The Horus Heresy
novel

It contains:
Tallarn: Witness
Tallarn: Siren
Tallarn: Executioner
Tallarn: Ironclad

Also in:
Books 44-46: Unabridged Audiobook Collection