鄧不利多的軍隊
Back at Hogwarts, Harry learns that the Minister for Magic Cornelius Fudge has appointed a new Defence Against the Dark Arts professor: Dolores Umbridge. She and Harry immediately clash, and she punishes Harry for his "lies" by forcing him to write a message with a magic quill, scarring his hand. When Ron and Hermione notice Harry's scars they are outraged, but Harry refuses to go to Dumbledore, who has distanced himself from Harry since the summer. As Umbridge's control over the school increases, Ron and Hermione aid Harry in forming a secret group to train students in defensive spells, calling themselves "Dumbledore's Army". Umbridge recruits the Slytherin students to expose the group. Meanwhile, Harry and Cho Chang develop romantic feelings for each other.