“You’re acting on Dumbledore‘s orders?” she repeated with a look of dawning wonder. Then she drew herself up to her fullest height.

“We shall secure the school against He-Who-Must-Not-Be-Named while you search for this — this object.”

“Is that possible?”

“I think so,” said Professor McGonagall dryly, “we teachers are rather good at magic, you know.”

Harry Potter and the Deathly Hallows – J.K. Rowling