Harry Potter is owned by JK Rowling
The Protector War is owned by SM Stirling
Slytherin Rising was created by J.L. Matthews
As more and more muggle-born children received their letters, The Eater kept getting passed to higher and higher ranked officials until he ended up in the dungeons of the royal palace on the Isle of Wight. It had become apparent to the royal court that every single child in the kingdom born within a year of the Change had received such a letter. The Court took this threat against the children of the realm very seriously.
When a woman claiming to be the Prime Minister appeared out of thin air in the King's audience chamber the Court was thrown into an uproar. In seconds, this woman had disarmed all of the King's guards and put them to sleep. While the King had not believed everything that this so-called "Prime Minister" had said, she had been able to convince the court that she did possess some sort of futuristic technology that still worked and that she was planning to kidnap the children of England.
A week later, throughout the realm, people appeared out of fireplaces and kidnapped all of the eleven-year-old children in England. These abductors easily overcame any resistance that was offered.
After this, the Eater's claims were taken more seriously. He was interrogated very thoroughly and was very co-operative.