Much of the conflict which happens in "The Interlopers" by H.H. Munro (Saki) involves man and nature. While the story is about two men who literally want to kill one another, the setting of the story (which includes the weather as well as their surroundings) prepares the reader for their enmity.
One clear conflict between man and nature in the story is the weather. On the night in which the story takes place, there is a violent storm. The narrator says it is so bad that the night creatures are not out and the rest of the animals in the forest are running away rather than just taking shelter as they normally do.
The roebuck, which usually kept in the sheltered hollows during a storm-wind, were running like driven things to-night, and there was movement and unrest among the creatures that were wont to sleep through the dark hours. Assuredly there was a disturbing element in the forest....
It is this vicious wind and storm which causes the tree to fall--the tree that traps Georg and Ulrich and eventually makes them easy prey for the wolves, another force of nature.