Together, they faced many challenges during their adolescence, including keeping the Philosopher's Stone from Professor Quirinus Quirrell, saving Ron's sister from the Chamber of Secrets, forming Dumbledore's Army, and fighting in numerous battles of the Second Wizarding War, including the Battle of the Department of Mysteries, the Battle of the Astronomy Tower, Battle of the Seven Potters and the Battle of Hogwarts. Ron also became a Gryffindor prefect and a Keeper on the Gryffindor Quidditch team during his fifth year at Hogwarts. He skipped his last year of school in order to accompany Harry and Hermione on a quest to destroy the Horcruxes of Lord Voldemort and fought in the Battle of Hogwarts in 1998, in which he lost his brother, Fred, a loss which devastated him and his family.