What are some examples of symbolism in the story?

Some symbols in "The Interlopers" are the beech tree and the wolves.
The beech tree falls because of the winter storm. It prevents Georg and Ulrich from shooting each other. The timing of the falling tree symbolizes the power of nature being greater than the power of men as shown through the quote,

And before the moment of hesitation had given way to action a deed of Nature's own violence overwhelmed them both.

The wolves also symbolize the power of nature over the power of men. The men are pinned down by the fallen tree and call for help. The wolves hear their yelling and appear. The men won't be able to fight the wolves while they are pinned beneath the tree.
The conflict of man versus man turns to man versus nature. The symbolism helps to show that nature does not care or reason and the destruction of nature is more powerful than the destruction of man.