The idea of their frightening her, and making her cry, and of my not being there to comfort her, was so excruciating, that it impelled me to write a wild letter to Mr. Spenlow, beseeching him not to visit upon her the consequences of my awful destiny.
So sensible of this, beforehand, that I had really felt ashamed of doing what I was nevertheless impelled to do, I went back to the inn.
It was what I remotely dreaded when I was first impelled to stay away from England.
There are no more uses of "impel" in the book.
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When in the Course of human events, it becomes necessary for one people to dissolve the political bands which have connected them with another ... that they should declare the causes which impel them to the separation.
Thomas Jefferson -- The Declaration of Independence
The only explanation which I could think of for this mass exodus was that I had somehow disturbed the wolves so seriously they had felt impelled to abandon their den.