Why don't Ulrich and Georg get along in "The Interlopers" and whom does Ulrich seek?

In Saki's short story, "The Interlopers," the feud over the disputed land continues because, although the grandfather of Ulrich von Gradwitz had won the lawsuit, the other family, the Znaeyms, "had not acquiesced in the disposition of the lawsuit."  As a consequence, enmity has developed between the families, and lasted for generations; von Gradwitz constantly seeks to catch the "poacher" on his land. So, in the exposition, von Gradwitz patrols the thick forest in search of his mortal enemy.

Of course, the double entendre of the story's title becomes evident when nature becomes an interloper in the form of the storm that knocks down the branches trapping von Gradwitz and the interloper upon his land, Znaeym, as well the appearance of the final interlopers, the wolves.