Skirmish in the Chamber of Secrets

The Battle of the Chamber of Secrets is a conflict that took place in 1993. It happened when the Horcrux of Lord Voldemort took Ginny Weasley into the Chamber of Secrets after posessing her. Harry Potter, Ron Weasley, and Gilderoy Lockhart went down to rescue. After Lockhart caused an avalanche to occur when Ron's wand backfired, Harry went into the Chamber and spoke with Voldemort, who told them that he possessed Ginny to get the Chamber opened. He, then, wrote Tom Marvolo Riddle and rearranged the letters to I am Lord Voldemort. After Harry realized the truth, Voldemort used Parseltongue to sic the basilisk after him. Fawkes, Albus Dumbledore's phoenix, soon showed up and clawed the basilisk's eye out. Unfortunately, the basilisk had an acute sense of hearing. Unsure of what to do, Harry placed the Sorting Hat on his head, took Godric Gryffindor's Sword and stabbed the basilisk. Fawkes, again, saved Harry's fatal wound, so he could tear out the basilisk tooth and destroy the Horcrux.

Afterwards, Fawkes flew Harry, Ginny, Ron, and Lockhart out of the Chamber, to Moaning Myrtle's disappointment, and no one was punished, until years later in the Battle of Hogwarts.