As Chapter 3 ends, what task did Albert's father send him on? What ulterior motive did Mr. Narracott have? Chapter 3-4 War horse

Albert is given the task of returning the Saddleback boar his father had borrowed to breed with the "sows and gilts." While he is away his father harnesses Joey and leads him away. Mr. Narracott intends to sell Joey, as he needs the money.