This is at the beginning of the story when the electricity goes out. The lights won't work, cars won't work, and anything the needs electricity doesn't work.
This is when they are in the gymnasium, and they hear the aliens talk from the sky.
This is when Cassie goes into Cincinnati, and finds dead bodies. She feels their necks and there still warm, so she knows that they were killed recently. She quickly runs to find a hiding spot and gets under the car. She then named the aliens the silencers because she didn't hear any gun shots, so she predicted they had silencers on their guns.
This is when Cassie walks into a log house, and finds one of her friends from high school. He takes care of Cassie because she is injured.
This is when Cassie leaves the log house in search of food. She see's a black figure moving. She gets worried, and starts shooting her gun at the figure.
This is at the end of the story. They sit under the bridge, and they start to cry because they can't believe that they survived.