Warhammer 40k - Imperial Guard Novel - Fifteen Hours by Mitchel Scanlon

Arvin Larn is terrified. On the battlefields of the far future, only an insane man wouldn’t be. Seventeen years old and still new to the Imperial Guard, he is thrust straight into his first war and must face horrors that his sheltered upbringing could never prepare him for. The trenches of the 41st millennium are filled with worse things than rats and trenchrot. For one, the world they fight for is being contested by the monstrous barbarian orks. The orks live for battle and know no fear, so it’s no wonder that the average life-span of an Imperial Guardsman on this forsaken world is only fifteen hours.