鄧不利多的軍隊
During the following year at Hogwarts, the Ministry passes Educational Decree Twenty-two, allowing Fudge to place Dolores Umbridge to the post of Defence Against the Dark Arts teacher (after Dumbledore failed to find a suitable candidate). Through her, Fudge gradually gains power over Hogwarts and Dumbledore, who he fears is building an under-age wizard army to overthrow the Ministry. Umbridge forbids practical defence practice in her classes, forcing Harry, Ron, and Hermione to form Dumbledore's Army (a defence group led by Harry) with fellow friends. When the Ministry discovers the D.A., Dumbledore, choosing to accept the responsibility, falsely claims that the organisation was his own subversive creation, and allows himself to be removed as headmaster (for the second time) rather than allow Harry to be expelled.