In Harry Potter and the Deathly Hallows, with Harry, Ron and Hermione absent from Hogwarts, Neville, Ginny and Luna begin a covert rebellion against new headmaster Severus Snape by reactivating the D. A. However, Luna is abducted at Christmas and Ginny leaves during Easter, leaving Neville for a few weeks as the D. A. 's leader. Neville tells Harry that most of the D. A. 's activity ceased shortly after Michael Corner was tortured by Death Eater siblings Alecto and Amycus Carrow for trying to rescue a first-year boy from imprisonment. The group thereafter hide from the Death Eaters in the Room of Requirement, using a secret passage to the Hog's Head to find food. The D. A. believed that if Harry returned he'd lead them in a revolution against Snape and the Carrows and are disappointed when he initially refuses to let them help. Harry does lead an impromptu revolt, but only himself, Luna and Professors McGonagall, Sprout, Flitwick and Slughorn take part in it, with Harry and Luna taking out the Carrows, and the professors (rallied by McGonagall and Harry) driving off Snape. In the book's climax, the D. A. (alongside the Order of the Phoenix) plays an important role in the Battle of Hogwarts, giving Harry enough time to find the remaining Horcruxes.