They do say the trees do actually move, and can surround strangers and hem them in. In fact long ago they attacked the Hedge: they came and planted themselves right by it, and leaned over it. But the hobbits came and cut down hundreds of trees, and made a great bonfire in the Forest, and burned all the ground in a long strip east of the Hedge. After that the trees gave up the attack, but they became very unfriendly. There is still a wide bare space not far inside where the bonfire was made.’
