Neville began school at Hogwarts School of Witchcraft and Wizardry in 1991 and was sorted into Gryffindor House, along with Harry Potter, Hermione Granger, and Ronald Weasley. Throughout his school years, he was mostly a shy, clumsy, introverted boy who was constantly being told by his grandmother that he was not good enough or living up to his parents' accomplishments. However, in his later years, he showed that he possessed great courage and perseverance: he became an important member of Dumbledore's Army, an organisation taught and led by Harry Potter with the goal of helping other students learn spells to attack and defend themselves. Neville would later fight in the Battle of the Department of Mysteries (1996), the Battle of the Astronomy Tower (1997), and the Battle of Hogwarts (1998). During the Battle of Hogwarts, having refused Voldemort's invitation to join the Death Eaters, he destroyed the seventh and final Horcrux when he beheaded the snake Nagini. He also co-led the D.A. during his final year in opposition to the Death Eater professors.