...What happened in Castlevania in the war of 1999...
We already know what happened as revealed in Aria of Sorrow:
-Military is involved in war of 1999
-Julius destroyed Dracula permanently(?) with a help of someone(Possibly from Hakuba)
-The Castle was sealed inside the moon
-Vampire Killer was left in the Castle
-Julius got an amnesia until the events in Aria of Sorrow
The more puzzling in IGA storyline for me is how on earth Maxim found the body parts of Dracula?