In the 600's! And things are getting intense.

Snape & McGonagall! 

So, now that Harry is dead set on looking for the diadem, first he needs to know what he's looking for. Luna offers to take him up to Ravenclaw Tower and show him what it looks like from the statue in the room. Immidiately when they get up there, they are found by the Alecto Carrow, one of the evil people who took over Hogwarts. She immidately presses her dark mark, which not only summons Voldy, must also Amycus Carrow and Proffesor McGonagall. Before those two get there, Luna stuns her. When he gets there, he doesn't see Harry because he hid under the Invisibility Cloak.  So he makes up a lie for when Voldy gets there, but McGonagall gets pissed and Amycus ends up spitting on her. Harry gets pissed back and curses Amycus, and then he tells McGonagall that he must find the diadem because it's too late to run form Voldy. McGonagall decided to help him, and gather with the other teachers to protect the school. They run off, but then run into Snape. The tension is running high between the two until the other teachers come. They all then do everything in their ability to protect the school with various charms and magical plants. Harry then heads back to the Room of Requirement (I'm gonna call it ROR from now on), and the Heads of the Houses get all their students moved into the Great Hall. Now the Slytherins must choose Voldy or Hogwarts because a battle is brewing! Harry then finds even more people in the ROR, even the Weasleys and Lupin. They then make everyone go to the Great Hall, except the Weasleys and OOTF members. Ginny pleads to fight, but they all think she's too young. The chapter then ends with Voldemort appearing outside of Hogwarts, sooooo angry and ready to take down some students.