In the novel's climax, Voldemort lures Harry into the Ministry of Magic in a plot to steal a record of a prophecy which concerns Harry and Voldemort. Harry and his friends face off against Voldemort's Death Eaters in a battle, during which the prophecy is smashed. The timely arrival of members of the Order of the Phoenix saves the children's lives, but Sirius Black, Harry's godfather, is killed in battle by Bellatrix Lestrange. In the entrance hall, Harry comes face to face with Voldemort for the fourth time in his life, but is saved by Dumbledore who engages with the Dark Lord in a ferocious duel. In the end, most Death Eaters are captured, and the return of Voldemort is confirmed within the magical world.
In the aftermath of the battle, Dumbledore explains to Harry that just before his birth, a prophecy was made saying that a child was being born with the power to defeat Voldemort. The prophecy could have referred to Harry or Neville Longbottom, but it was Harry that Voldemort chose to hunt down. Since his return, Voldemort has been determined to find out the rest of the Self-fulfilling prophecy, which Dumbledore reveals to Harry: firstly, "the Dark Lord will mark him as his equal", and that "neither can live as the other survives" - ultimately, either Harry or Voldemort will kill the other.
This submission is clearly written. The use of the verb "smashed" doesn't quite make sense. The use of the word "with" in "engages with the Dark Lord in a ferocious duel" is unnecessary, but acceptable. It would be better to omit it.