I did not dare return to the apartment which I inhabited, but felt impelled to hurry on, although drenched by the rain which poured from a black and comfortless sky.
My rage was without bounds; I sprang on him, impelled by all the feelings which can arm one being against the existence of another.
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.