It was a risk searching the Room of Requirement for Ravenclaw's diadem. Not many of the D.A. were thrilled to flee their sanctuary, but somehow Harry, Ron, and Hermione convinced them to rally the rest of the school, the remaining members of the Order, anyone who would help them defeat Voldemort. Half of the D.A. snuck back to the common rooms, and the other half trekked through the tunnel to the Hog's Head.