Why did Dumbledore let Umbridge teach?

The whole integration of Umbridge in the school was insidious and difficult for Dumbledore to act against. She was appointed by the Ministry when Dumbledore was unable to find a candidate for the Defence Against the Dark Arts post, and everything followed from there. Thanks for the A2A!

What did Umbridge make Dumbledore’s Army write on their hands?

Black Quill
He used the Black Quill during many detentions, from 5:00 p.m. to well over midnight, until he acquired a scar on the back of his hand reading “I must not tell lies”.

What does Umbridge make Harry Potter write with the black punishment quill?

Dolores Umbridge forced students to use it when they did lines in detention with her, to make sure that the message of the lines “makes an impression” (OP13). Harry often did lines with this quill in detention during the 1995 – 1996 school year, always writing the same words: I must not tell lies. (OP13, OP15).

Did Dumbledore know that Umbridge was holding those detentions?

Dumbledore did not know that Umbridge was holding those detentions. Had he known, he would’ve intervened, as he did with Marietta, but Umbridge’s first victim, Harry, refused to go to Dumbledore despite Ron’s urging. ‘I thought you said she was just giving you lines?’

What did Dolores Umbridge carve on Harry Potter’s hand?

On September 3, 1995, she made him carve the words “I must not tell lies” into his hand. Detention sucks. But no matter how boring or inconvenient it may be, it probably is never as bad as the detentions Harry Potter suffered through with Professor Dolores Umbridge.

How did Umbridge rise to power in Harry Potter?

As Senior Under-Secretary to the Minister for Magic in 1995, Umbridge managed to claw her way up to power using Cornelius Fudge ‘s increasing paranoia and insecurities to her advantage. She also used her authority to intimidate Harry Potter during an interrogation before the Wizengamot.

Did Umbridge order the Dementor attack on Harry Potter?

Harry was cleared of all charges, much to Umbridge’s disappointment. What Umbridge did not reveal at the time was that she herself had ordered the Dementor attack on Harry and his cousin Dudley Dursley, since both possible outcomes would work in the Ministry’s favour.