Through the windows, we saw barbed wire; we understood that this was the camp . . .
Suddenly there was a terrible scream: “Jews, look! Look at the fire! Look at the flames!”
And as the train stopped, this time we saw flames rising from a tall chimney into a black sky . . . .
We jumped out. I glanced at Mrs. Schächter. Her little boy was still holding her hand.

In front of us, those flames. In the air, the smell of burning flesh. It must have been about midnight. We had arrived at Birkenau, reception center for Auschwitz.
–Night,
Elie Wiesel
What is the author’s primary purpose in this passage?
Which phrase best supports the author’s purpose?
How does the memoir genre allow the author to achieve his purpose in this passage?