Sentence:  [W]hen they have found the Trees on which they [the elk] lean, they cut and ſaw them, ſo that when the "Elk" comes, he <WSD>overthrows</WSD> the Tree and falls with it; and being unable to riſe, is ſo taken alive. 
Meaning of the word marked with <WSD> tags:  To throw down to the ground, to overturn.