Col. "Iron Hand" Straken of the Catachan II Regiment is the subject of this novel. Catachan is a death-world where the fauna and flora are so lethal that close to 6 or 7 out of 10 Catachans survive to puberty. Those who do, men and women, are some of the largest and most heavily built humans in the Imperium. They also are the premier jungle fighters and guerrilla fighters in the Imperial Guard.
The Catachan II is sent to Dulma'lin, a mining world, to battle an Ork invasion. As soon as they land, the operation is a disaster as the supporting forces are overrun by Orks and the Catachan II is trapped on the planet with an Ork army. The Catachans must use their training and skills to fight a vicious guerrilla war while trying to draw out the Ork warboss- Killzkar.
This was an interesting read, as there are so Space Marines at all. It makes sense as there are supposed to be approximately 2 million Astartes, which pales in comparison to the nearly 1 million worlds under the control of the Imperium. Thus, the vast majority of the wars are fought without Space Marines, who are used for only the most dire circumstances.
Thus a book that shows the life of ordinary humans in the Guard trying to fight a terrifying alien threat was a nice change of characters. From the way teams operate to the conflicts that arise from the Commissars and the regular troops, this is a side of Imperial campaigns that often gets passed over for the appeal of the Astartes.
From internal politics, to Imperial politics, as well as a great deal of war-this is an excellent book. If you like reading about the way Imperial Guard fight and a look inside the ordinary men and women who make up the uncounted legions of the Imperial Guard, then this book is for you.