What is a major thing that happened to Pip in the beginning of the book?

At the very beginning of the book, the narrator, Pip, who introduces himself and describes a much younger Pip staring at the gravestones of his parents. This tiny, shivering bundle of a boy is suddenly terrified by a man dressed in a prison uniform. The man tells Pip that if he wants to live, he'll go down to his house and bring him back some food and a file for the shackle on his leg.