Warhammer 40k - Yarrick: Chains of Golgotha by David Annandale

From the ashes of the Second War of Armageddon a hero of the Imperium emerged. War-torn and bloody, Commissar Yarrick swore vengeance on the beast that escaped his righteous wrath, the despoiler of Armageddon - Ghazghkull Thraka. Tracking down the ork warlord to the desolate world of Golgotha, Yarrick leads an armoured company to destroy the beast but does not reckon on Thraka's cunning. Ambushed, his army all-but destroyed, Yarrick is captured and awakes to find himself aboard the beast's space hulk facing a fate worse than death...

(I swear to god if those descriptions don't fucking behave... Why does this thing think it's Blood and Thunder? I chose ebooks for the category, not comics!)