The Battle of Hogwarts was a conflict in the Harry Potter universe that ended the Second Wizarding War. It took place in the early hours of 2 May, 1998, within the castle and on the grounds of Hogwarts School of Witchcraft and Wizardry.
The battle ended with a decisive victory for the Order of The Phoenix (a secret society fighting against Lord Voldemort) with many Death Eaters and Voldemort himself dead. It was the most devastating battle of the Wizarding War, with casualties including: Lord Voldemort, Bellatrix Lestrange, Remus Lupin, Nymphadora Tonks, Severus Snape, Fred Weasley,
Colin Creevey,
Lavender Brown, and at least fifty more unnamed who fought against Voldemort and his Death Eaters.