The Chronicles of Narnia: The Lion, the Witch and the Wardrobe
Edmund persuades Peter to battle with the Witch. Peter's army begins losing, and to stop the witch from turning others to stone, Edmund destroys the Witch's wand and gets stabbed while he does so. Then, as the Witch fights Peter, Aslan comes and kills her with his roar. The Pevensies become Kings and Queens, staying in Narnia until they are adults.