Voldemort, having lost his physical body and magical powers, fled to a forest in Albania as a wisp of a shattered soul.
However, his Killing Curse on their son, Harry, backfired due to the sacrifice Harry's mother made for him. On 31 October, 1981, Voldemort attacked the home of James and Lily Potter in hopes of preventing the prophecy regarding his downfall from ever coming to fruition. The Potter family home under attack, Lily is murdered by Lord Voldemort Others, such as Alice and Frank Longbottom, were left permanently injured, both physically and/or mentally, to the extent that they could no longer perform magic. Several great wizards were murdered in this time brothers Fabian and Gideon Prewett, the McKinnons, the Boneses, and James and Lily Potter. It included Lord Voldemort's rise to power, the induction of the Death Eaters, and the mass chaos that resulted in his reign of terror. The First Wizarding War was fought for approximately eleven years, from 1970 to 1981. that’s how it used to be." - Sirius Black explaining the First Wizarding War to the trio the Ministry of Magic’s in disarray, they don’t know what to do, they’re trying to keep everything hidden from the Muggles, but meanwhile, Muggles are dying too. Every week, news comes of more deaths, more disappearances, more torturing. You’re scared for yourself, and your family, and your friends. You don’t know who his supporters are, you don’t know who’s working for him and who isn’t you know he can control people so that they do terrible things without being able to stop themselves.
The Second War technically began on 24 June, 1995, though was not officially announced by the Ministry until nearly a year later on 17 June, 1996, and ended on 2 May, 1998, at Hogwarts School of Witchcraft and Wizardry, after the death of the Dark Lord. Harry Potter, prophesied as the "Chosen One" capable of bringing an end to Voldemort's power, took an active role in this war, alongside his peers in Dumbledore's Army and the members of the Order of the Phoenix. Voldemort and his followers, the Death Eaters, waged a violent campaign across both the wizarding and Muggle communities, seeking to topple the Ministry of Magic and subjugate Muggle-borns, with the eventual goal of conquering the entire wizarding world, and the Muggle world along with it. The Second Wizarding War referred to the conflicts stemming from the Dark Wizard Lord Voldemort's second rise to power after his return in 1995. The Order is better prepared, we’ve got a head start, we know what Voldemort’s up to -" - Remus Lupin regarding the upcoming Second Wizarding War in August 1995 to Molly Weasley