This seems to be the case in the affair of Priber, which was the worst of those "damages" Adair did to the French.

Priber was "a gentleman of curious and speculative temper" sent by the French in 1786 to Great Telliko to win the Cherokees to their interest.

At this time Adair was trading with the Cherokees.

He relates that Priber, "more effectually to answer the design of his commission...

ate, drank, slept, danced, dressed, and painted himself with the Indians, so that it was not easy to distinguish him from the natives,--he married also with them, and being endued with a strong understanding and retentive memory he soon learned their dialect, and by gradual advances impressed them with a very ill opinion of the English, representing them as fraudulent, avaritious and encroaching people; he at the same time inflated the artless savages with a prodigious high opinion of their own importance in the American scale of power....