She also refuses to teach her students how to perform defensive spells, prompting Harry, Ron and Hermione to form their own Defence Against the Dark Arts group (with students from Gryffindor, Ravenclaw and Hufflepuff), which they call Dumbledore's Army.
Hun nægter også at lærer eleverne at udføre enhver form for forsvarsbesværgelser, hvilket får Harry, Hermione og Ron til at danne deres egen gruppe, der skal lærer eleverne (fra Gryffindor, Ravenclaw og Hufflepuff) om forsvar mod mørkets kræfter, som de kalder Dumbledores Armé.