What new policy did Napoleon announce regarding obtaining articles the farm needed?

Napoleon announces that they will now be trading with the nearby farms, the animals cannot remain silent. Not only do they not understand why they have gone without if the farm actually has food goods to trade, but they are also puzzled by the apparent disregard of a resolution. When they voice their concerns, Squealer--Napoleon's propaganda machine--tells them that there was never any resolution against trade and makes it seem as if their own confusion caused them to think that there was. He even brings in Snowball and tells that he must have misguided them.