He paused; a grim silence gripped the whole clearing, broken by a contemptious Rumble from Tigerstar. "Mew away, little kittypet. It won't change anything."
Firestar ignored him. "Being deputy wasn't enough," he went on. "Tigerstar wanted to be leader of the clan. He set a trap for Bluestar by the Thunderpath, but my own apprentice strayed into it instead. That's how Cinderpelt came by her crippled leg."
A shocked murmer swept through the clearing. Except for Bloodclan, they all knew of Cinderpelt, she was popular even with cats of other clans.
Then Tigerstar conspired with Brokentail, the fomer leader of ShadowClan, who was ThunderClan's prisoner," Firestar told the listening cats. "He brought a pack of rogues into ThunderClan camp, and tried to murder Bluestar with his own claws. I stopped him, and when ThunderClan had beaten off the attack we drove him into excile. As a rogue, he slaughtered, Runningwind. Then before we knew what he was up too, he had made himself leader of ShadowClan.

Erin Hunter