Final answer:
The extermination camps were being evacuated due to the non-stop killing. Elie Wiesel believed that at the twelfth stroke, he and the other prisoners would be killed.
Step-by-step explanation:
The extermination camps were being evacuated due to the non-stop killing that was taking place there. The Nazis had established these camps with the purpose of mass murder, and they were not meant to house prisoners for long periods of time. Elie Wiesel, a Holocaust survivor, believed that at the twelfth stroke, he and the other prisoners would be killed. This belief was due to their experiences in the camp and the knowledge that the Nazis were merciless in carrying out their acts of genocide.