What two sensory details does Jeanne record in chapter 9? What event caused these two things to be seen and heard by her?

I think that you might be referring to the ending of chapter 9. Jeanne sees the searchlights which she had seen only once before. Though the lights flooded the gates, the fence and the camp every night, Jeanne usually goes to bed early, and their barracks are far enough inside the camp to not be affected by the lights. The searchlights are a reminder that they are not free. They are a sure indication that they are prisoners.

They echo across the valley and ripple between the mountains. The bells ring out across the valley, all night and until noon the next day. They ring out in sorrow and pain that they are prisoners.