This week's battle is~

LionClan vs. BloodClan

Book it took place in~
The Darkest Hour

Build up~

Tigerstar, having brought BloodClan into the forest in order to drive out any cats that opposed him, is killed by Scourge when he attempts to order BloodClan to attack. Scourge then delivers an ultimatum to the Clans, ordering them to leave the forest in three days or die. Firestar unites the four Clans into LionClan in order to combat the threat.

The Battle~

The battle starts when Scourge snarls "Attack!" to BloodClan, and Firestar does the same for LionClan. The battle is brutal; many cats are killed or are heavily wounded. Darkstripe is the first known cat to die, killed by Graystripe with a blow to the throat that no cat could have survived. Bone, the BloodClan deputy, kills Whitestorm, ThunderClan's deputy, but Bone doesn't live long after his victory. He is killed by a swarm of apprentices from all four Clans. Firestar is killed once by Scourge, but Scourge, unknowingly, thought he had killed Firestar for good, and is shocked when Firestar regains consciousness. Firestar and Scourge lock into battle again, and Firestar is triumphant in killing Scourge, and BloodClan left the forest.

Deaths~

Tigerstar (9 lives) killed by Scourge
Darkstripe killed by Graystripe
Whitestorm killed by Bone
Bone killed by a swarm of apprentices
Firestar (1 life) killed by Scourge
Scourge killed by Firestar