Into the Wild (Warriors)
The four Clans, ThunderClan, WindClan, ShadowClan, and RiverClan, fight with each other to occupy hunting grounds. In a battle that takes place right before Firepaw joins ThunderClan, the ThunderClan deputy (second-in-command), Redtail, dies. Firepaw later learns from Ravenpaw that the former deputy was not killed by an enemy Clan, but by Tigerclaw, a ThunderClan warrior. Tigerclaw killed Redtail because he wanted to be deputy instead. Tigerclaw knows that Ravenpaw saw him kill Redtail, so Firepaw and Graypaw help Ravenpaw escape the forest to live on a farm, because Tigerclaw plans to kill Ravenpaw for knowing his secret.