The author is able to personalize the event by using the words we and us.
Explanation:
The fact that "Night" is a memoir rather than a biography or informational text helps the author achieve his purpose in the excerpt by allowing him to personalize the events by using the pronouns "we" and "us".
A memoir is historical account or biography based on personal knowledge and experience , therefore the author's purpose is achieved because he is able to personalize the experience. Using those pronouns helped bring the readers closer to the action and allowed them to "see" and "feel" the writer's emotions.
