You catch wild pigs by finding a suitable place in the woods and putting corn on the ground. The pigs find it and begin to come everyday to eat the free corn. When they are used to coming every day, you put a fence down one side of the place where they are used to coming. When they get used to the fence, they begin to eat the corn again and you put up another side of the fence. They get used to that and start to eat again. You continue until you have all four sides of the fence up with a gate in the last side. The pigs, which are used to the free corn, start to come through the gate to eat the free corn, you slam the gate on them and catch the whole herd.
Suddenly the wild pigs have lost their freedom. They run around and around inside the fence, but they are caught. Soon they go back to eating the free corn. They are so used to it that they have forgotten how to forage in the woods for themselves, so they accept their captivity.