The French invaders, like an infuriated animal that has in its onslaught received a mortal wound, felt that they were perishing, but could not stop, any more than the Russian army, weaker by one half, could help swerving.
There are no more uses of "onslaught" in the book.
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They withstood the onslaught and counterattacked.
Her campaign did not survive an onslaught of attack ads.