When the ork hordes of the warlord Snagrod lay waste to the planet of Badlanding and devastate the Crimson Fists force sent to stop them, Chapter Master Kantor is forced into a desperate defence of the Fists home planet, Rynn's World. But tragedy strikes. An errant missile destroys the Space Marines' fortress-monastery, killing most of their number outright. With a handful of battered survivors in tow, Kantor must cross a continent if he is to have any hope of defeating Snagrod's orks and preventing his Chapter's total annihilation.

Read it because
This is the dramatic story of the defining moment in the story of the Crimson Fists Chapter: orks versus Space Marines action at its brutal best.