Simplify the following text for a Grade 7 native English-speaking person.
Original: Then Peter comes and kills Maugrim with his sword , and some of the troops of Aslan follow the other wolf to the witch 's camp and rescue Edmund .
Simplified: When Peter intervenes Maugrim attacks him and Peter kills him with his sword . After Peter is knighted by Aslan , some of Aslan 's troops follow the other wolf to the witch 's camp and rescue Edmund .