You have also some links for reminding better the musics. Maybe it´s not the concrete piece you have watch on the video that day, but it´s very similar. So don´t worry if you didn ´t do perfect. Now revise and study.
What do you think is described in this movement by Berlioz?
What do you think about the way he used the orchestra and the instruments?
Answer in your notebook reading on this link.