"I'd take you on any time on my own. Tonight, if you want. Wizard's duel. Wands only – no contact. What's the matter? Never heard of a wizard's duel before, I suppose?"
A duel is a confrontation between two or more wizards or witches. The combatants face each other, bow, and then attempt to disarm, injure, or kill each other in order to force submission, and thus a winner is decided. Opponents are only permitted to use magical means of combat.
There are rules and customs that define how a proper duel is performed and that are normally known to wizards and witches born to magical families, even at a young age. Ron Weasley, for instance, told Harry Potter some of the rules of duelling as a first year student at Hogwarts School of Witchcraft and Wizardry after Harry was challenged to a duel by Draco Malfoy in 1991. In the 1992–1993 school yearGilderoy Lockhart formed the duelling club, in which duelling strips were used in a system similar to that of modern fencing.[1].
"You have been taught how to duel Harry Potter? We bow to each other, Harry. Come, the niceties must be observed… Dumbledore would like you to show manners… Bow to death, Harry… I said, bow."
In a formal duel, one wizard or witch challenges another, although it is implied that duels are not commonplace in modern polite society. If the other person accepts, they then arrange a meeting time and place for the duel. Draco challenged Harry this way in their first year, though it was really an attempt to get Harry into trouble for being out of his dormitories after curfew[2]. Opponents bow to one another before beginning to fight, as Lord Voldemort reminded Harry Potter before their duel in the graveyard of Little Hangleton in 1995.[3] Lockhart has gone as far as twirling his hands while bowing, possibly trying to make himself look more gentlemanly. However, duellists who do not respect their opponents do not usually bow correctly, as Snape simply jerked his head, while Harry, Draco Malfoy, and Voldemort barely bent their heads at all.
Duellists will often have a "second" in a formal duel — a person, usually a trusted ally, who will act as a replacement for one duellist if necessary. Ron Weasley volunteered to be Harry's second in the aforementioned planned duel with Draco, who chose Vincent Crabbe.[1]
There is a standard rule in duels that only magical means may be used to fight an opponent, and that there is to be no physical contact between the duellists[2]. Millicent Bulstrode broke this rule when she duelled Hermione Granger in 1992 in the Duelling Club; the much larger girl ended up wrestling Hermione to the ground and holding her in a headlock.[4]
The parties of a duel might also agree to other limits, unless planning to duel to the death, which is only common practice in a war. Minerva McGonagall, for example, informed fellow professor Horace Slughorn just before the Battle of Hogwarts that if any Slytherin attempted to sabotage their defence efforts or to fight them, they would "duel to kill", which alarmed him[5]. This may indicate that duellists generally agree not to use particularly dangerous and/or illegal spells, such as the Unforgivable Curses.
Egbert defeats Emeric and becomes the master of the Elder Wand. It should be noted that he was the only known wizard, apart from Albus Dumbledore and Harry Potter, to defeat the owner of the Elder Wand in a duel.
Albus and Grindelwald were going to expose the wizarding world and enslave muggles. Aberforth tried to stop them but Gellert was furious with him and tortured Aberforth. Albus protected his brother and a three-way Duel broke out (Duel at Godric's Hollow).
By the end of the duel Ariana Dumbledore stepped in and was killed by a rogue spell. Gellert fled and the two brothers were left in ruins.
As the Ashwinder that portrayed the worm exploding in a spray of hot ash, "Amata" and "Asha" turned on each other and began duelling. Who won is unknown, as the hall was vacated. [6]
Death Eaters were rioting at the World Cup, hanging Muggles upside down in the air and blasting tents away. Ministry of Magic workers fight the Death Eaters, until Barty Crouch Jr. fires the Dark Mark in the sky and the Death Eaters flee.
Harry fires a Furnunculus Curse at Malfoy. At the same time, Malfoy fires a Densaugeo Hex. The spells hit each other and richochet everywhere, Harry's hitting Goyle and Malfoy's hitting Hermione.
Voldemort used Avada Kedavra and Harry used Expelliarmus. Due to the twin cores of the wands, the wand streams locked, and through Harry's willpower, Priori Incantatem was triggered from Voldemort's wand and Harry managed to escape.[3]
In 1996 after Dumbledores Army got exposed to Umbridge, Dumbledore blamed himself for the organisation to protect Harry and Fudge ordered Dawlish and Kingsley to arrest Dumbledore.
Dumbledore incapacitated Fudge, Umbridge, Dawlish, Percy and Kingsley despite the fact that Kingsley (Who was the only notably powerful one out of them) was a member of the Order of the Phoenix, as it would raise suspicion by Fudge. This allowed Dumbledore to escape from Hogwarts with Fawkes before they could recover.
Umbridge attempted to sack and arrest Hagrid during the night with some Aurors but McGonagall intervened.
Hagrid was resistant to stunning spells because he was half-giant as they bounced off him while McGonagall was badly injured by four stunning spells. Fang was stunned by Umbridge. Hagrid then defeated all the Aurors with his great strength and escaped from Hogwarts before Umbridge could stop him.
Tonks stunned Lucius before he could cast anything (It is unknown if this spell made contact but since Lucius didn't have another duel for a bit and that he didn't draw his wand in time it might have hit him). Tonks started duelling Bellatrix and Bellatrix attempted to kill Sirius, knocked out Tonks and one of Bellatrix's curses knocked Sirius threw the Veil of Death.
They dueled so fiercely their wands were blurs. Sirius defeats this Death Eater, as he is unhurt and able to fight Antonin Dolohov later on in the battle.
Sirius rams Dolohov with his shoulder, and they start to duel. Dolohov attempts to use his curse on Sirius but Harry hits him with a Full Body-Bind Curse.
Harry, filled with rage over his godfather's death chases Bellatrix into the Ministry Atrium. Harry hits Bellatrix with the Cruciatus Curse but doesn't cast it properly.
Dumbledore managed to protect Harry Potter from Voldemort, who was forced to flee when Ministry officials arrived and saw him.[7]Fawkes swallows a Klling Curse sent at Dumbledore.
Harry Potter sees McGonagall, Ron, Lupin, and Tonks each battling a seperate Death Eater. Harry glimpses Alecto running away while McGonagall screams "Take that!".
Harry's wand recognised Voldemort as an enemy and fired golden fire at him, allowing Harry and Rubeus Hagrid to escape. Hedwig is killed by a stray Killing Curse.[5]
Harry and Ron were freed from the dungeons by Dobby and raced to rescue Hermione Granger, who had been tortured into unconsciousness with the Cruciatus Curse.
Ron disarmed Bellatrix. Harry Stunned Lucius Malfoy. Bellatrix threatened to kill Hermione with her knife and stole Harry and Ron's wand from them but Dobby dropped the shandeleir on Bellatrix and Hermione and it narrowly missed. Harry stole back his and Ron's wands and he took Draco's too. Harry stunned Greyback with the 3 wands and the spell was so powerful it lifted Greyback off his feet and he flew to the roof and back down again. Harry, Ron, Hermione and Dobby escape with the wands of Bellatrix and Draco, but Bellatrix threw her knife that killed Dobby as he Disapparated.[5]
McGonagall was duelling Snape alone until Flitwick enchanted the suit of armour that Snape was hiding behind. Pomona Sprout and Horace Slughorn were behind Flitwick but didn't cast any spells. Snape ran away when Flitwick came.
Harry, Ron, and Hermione travel to the Room of Requirement to get Rowena Ravenclaw's Diadem; Draco, Crabbe, and Goyle follow them and they engage in a duel. Harry, Ron, and Hermione defeat Draco, Crabbe and Goyle, resulting in Crabbe's death.
Death Eater fell under three spells cast by Harry Potter, Ron Weasley, and Hermione Granger, who arrived to help. Fred was killed by an explosion almost immediately afterwards.
Dean and Parvati were duelling individually (Dean with Dolohov and Parvati with Travers) until a masked Death Eater was distracted by Ron Weasley and Dean stunned him. Dolohov tried to curse him until Parvati cast Petrificus Totalus on him. It is unknown what happened to Travers, but since he was out numbered Dean and Parvati probably won.
Rookwood was pursuing the two wizards until Percy came and attacked Rookwood. It is unknown who won this duel because both wizards had another duel against another wizard.
Voldemort used Avada Kedavra and Harry used Expelliarmus. Because Voldemort was using the Elder Wand, which owed its allegiance to Harry, not only was Voldemort disarmed, but his own curse rebounded, killing him.[5]