The three fellows still abroad upon the island did not greatly trouble us; a single sentry on the shoulder of the hill was sufficient to ensure us against any sudden onslaught, and we thought, besides, they had had more than enough of fighting.
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.