Warhammer 40k - Imperial Guard Novel - Death World by Steve Lyons

The Catachan Jungle Fighters of the Imperial Guard are an elite regiment, that specializes in destroying the Emperor’s foes on the most dangerous worlds of the Imperium. Their training is put to the test when a squad is sent to the death world of Rogar III in response to an ork incursion. But they must also do battle with the planet itself and the mysterious figures that stalk them across the deadly terrain.