However, in the series finale, she does not become headmistress at the start of term as expected; Snape is appointed by the new Minister for Magic Thicknesse, who is actually under the Imperius Curse and acting for Voldemort. Death eater Alecto Carrow replaces McGonagall as deputy headmistress. Despite the many changes, she is retained as head of Gryffindor House. Before the Battle of Hogwarts, she goes to the Ravenclaw tower and finds Alecto stunned by Luna and Amycus Carrow searching for Harry. She 's surprised when Amycus tells her Voldemort warned them Harry would try to break into the Ravenclaw Tower, proudly telling him Harry has no business on the Ravenclaw Tower, for Harry is in her House, Gryffindor. When Amycus suggests blaming the students to compensate for his sister 's state, McGonagall immediately intervenes. In response, Amycus spits in her face. Harry, who is present and hidden under his invisibility cloak, reveals himself and uses the Cruciatus Curse on Amycus. Harry then informs McGonagall that Voldemort is on his way and after tying up both the Carrows and placing them in a net, she sends three Patronuses -- which manifest into a cat - to warn the other three Heads of House. When on her way to meet the Heads of House, she meets Snape, who questions her about Harry 's whereabouts. Not realising that Snape is a re-doubled agent acting for the good side and not knowing that he has important information for Harry, she attacks him, engaging in a fierce duel. With help from Professors Sprout and Flitwick, she succeeds in driving Snape away. McGonagall then takes charge of the school again and proceeds to secure it against Voldemort to ensure Harry can fulfil his mission from Dumbledore. She also organises the evacuation of the school 's under - age students to ensure their safety. She then leads the remaining students, the staff of Hogwarts, and members of the Order of the Phoenix in the fight against Voldemort. She is seen during the battle with a large gash on her cheek and commanding a herd of charmed desks to charge at Death Eaters. When Harry has been apparently killed, she screams, causing Bellatrix Lestrange to laugh. Finally, McGonagall ends up duelling Voldemort alongside Kingsley Shacklebolt and Professor Slughorn. As is confirmed in The Tales of Beedle the Bard, McGonagall becomes Headmistress of Hogwarts after the Battle of Hogwarts and Snape 's death; however, in an interview Rowling said McGonagall would be retired by the time of the Deathly Hallows epilogue (19 years after the main events of Deathly Hallows), as she is "getting on in years ''.
who becomes headmaster after the battle of hogwarts
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