<P> 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 '' . </P>
<P> 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 '' . </P>
who becomes headmaster after the battle of hogwarts
who becomes headmaster after the battle of hogwarts
McGonagall
McGonagall