This flashback occurs in the very first chapter of A Long Way Gone. The narrator is running away from home with Junior and Talloi, after witnessing several dead people, victims of the conflict he is putting into context.
The flashback works as a way to introduce the reader into Sierra Leona's independence, as well as to show that his father was the first one to tell him about his country's history.
However, in that part of the story, Beah is not with his father anymore and he wonders what he would have to say about the conflict he and his people are now suffering.