The Blackwood story is "Ancient Lights". Is about a walker who is a surveyor´s clerk looking for a little wood that a client want to cut down to have a better view.
He found it and decided to walk througt it for a short cut to the client´s house. He inexplicably got lost and in his head he heard "No, it´s not his wood. It´s ours". He saw strange visions, got scared, run, tumble, just to end up in the same place, with the bushes and trees closing in, and then a few more vague visions.
I´m not gonna spoil the ending. I think this may be your story.
Hope i helped !!