40. "From what I remember (SPOILERS)" In response to In response to 33
Harry was dealing with a number of issues in facing Voldemort.
The most daunting of them was, of course, the Horcruxes. By having his soul split in so many different pieces, it became almost impossible to kill. So...when Neville killed the final horcrux Voldemort DID know about (after Voldemort killed the Horcrux he didn't know about)...he was fully vulnerable.
The remaining trouble was due to the fact that Voldermort and Harry's wands shared a similar core. So, in disarming Draco (after he had disarmed Dumbledore), Harry was the true owner of the Elderwand (?)...which was in turn one of the Deathly Hallows. So when they dueled the last time...it was pretty much a wrap.