Dumbledore's Army
Harry is also gifted in Defence Against the Dark Arts, in which he becomes proficient due to his repeated encounters with Voldemort and various monsters. In his third year, Harry becomes able to cast the very advanced Patronus Charm, and by his fifth year he has become so talented at the subject that he is able to teach his fellow students in Dumbledore's Army, some even older than him how to defend themselves against Dark Magic. At the end of that year, he achieves an 'Outstanding' Defence Against the Dark Arts O.W.L., something that not even Hermione achieved. He is a skilled duellist, the only one of the six Dumbledore's Army members to be neither injured nor incapacitated during the battle with Death Eaters in the Department of Mysteries in "Harry Potter and the Order of the Phoenix". He also fends off numerous Death Eaters during his flight to the Burrow at the beginning of "Harry Potter and the Deathly Hallows".