What was the spell McGonagall use against Snape?

the Imperius Curse
As Amycus rose grogily, McGonagall cast the Imperius Curse on him and made him hand both his and his sister’s wand to her and then lie down next to his Stunned sister.

Who is the next headmaster after Snape?

According to Harry Potter Wiki, Minerva McGonagall became headmistress after Snape died. This would be the most obvious choice as she had served the school for many years and was deputy headmaster to Dumbledore.

Was Professor McGonagall the most powerful headmaster in Hogwarts history?

There are many instances throughout the series that prove Professor McGonagall was perhaps the most powerful headmaster in Hogwarts’ recent history, at least after Dumbledore. She defeated Snape when he was headmaster and when the Death Eaters invaded Hogwarts she defeated Alecto Carrow after a brief duel and even challenged Voldemort.

Who is the headmistress of Hogwarts after Dumbledore?

McGonagall is the only person on this list who does actually take the title of headmistress. After Dumbledore, she becomes the head of Hogwarts, a job which she rightfully deserves. McGonagall might have been strict and expected a lot of her students, but she was also caring and devoted.

What did Mary McGonagall do after Dumbledore?

After Dumbledore, she becomes the head of Hogwarts, a job which she rightfully deserves. McGonagall might have been strict and expected a lot of her students, but she was also caring and devoted. She is a powerful witch who could have kept Hogwarts safe while still making sure that the academics of the school were up to par.

Why was DexDexTer chosen as the headmaster of Hogwarts?

Dexter was the headmaster of Hogwarts during the 18th century and the reason for his appointment was possibly his traditionalist outlook towards honor and duty, and not his wizarding powers, per se. He was often seen reprimanding Phineas Nigellus for ‘dereliction of duty’ and criticizing other wizards for making deals with criminals.