Dumbledore's Army, also known as the D.A. or Defence Association, was a secret organization initiated by Harry Potter, Hermione Granger, and Ron Weasley to teach their fellow Hogwarts students proper Defence Against the Dark Arts in 1995. This organisation was made necessary by the refusal of Dolores Umbridge. It had approximately 25 members. they are : Harry Potter, Hermione Granger, Ronald Weasley, Fred and George Weasley, Ginny Weasley, Luna Lovegood, Neville Longbottom, Dean Thomas, Hannah Abbott, Lavender Brown, katie Bell, Susan Bones, Terry Boot, Cho Chang, Michael Corner, Colin and Dennis Creevey, Marietta Edgecombe, Justin Finch Fletchley, Seamus Finnigan, Anthony Goldstein, Angelina Johnson, Lee Jordan, Ernie Macmillan, Padma and Parvati Patil, Zacharias Smith, alicia Spinnet.
It was restarted by Neville Longbottom, Ginny Weasley, and Luna Lovegood during the 1997–1998 school year after Hogwarts fell under the control of Lord Voldemort in order to oppose Death Eater professors Alecto and Amycus Carrow, who spread propaganda against Muggles and Muggle-borns and taught the Dark Arts. Dumbledore's Army played a vital role during the Second Wizarding War, and members of the organisation fought in the Battle of the Department of Mysteries, the Battle of the Astronomy Tower, and the Battle of Hogwarts.
