Twelve Wolves (Legends of the Space Marines)

Enemy forces are on Fenris. The homeworld of the Space Wolves swarms with traitors and heretics sworn to the service of the Apostate Cardinal Bucharis. As the enemy lay siege to the Fang, two Space Wolves - a venerable Long Fang and his impetuous Blood Claw charge - work to disrupt the enemy lines, following the principles of the Twelve Wolves. Read it because
As a treacherous enemy lays siege to Fenris, a venerable Long Fang and his impetuous Blood Claw charge attempt to turn the tide of battle in the Space Wolves favour.