Thomas Jeynes served in the Royal Navy.
"He was without exception the most cold-blooded and bad fellow I ever met with. I have seen him thrash the men with the end of a rope in the most unfeeling manner, until he was tired, making use of the most abusive language; and for his tyranny was obliged to quit the ship; but, to give the devil his due, [he] was what we call a bit of a sailor, and if he pleased (which was seldom) could make himself agreeable."— James Anthony Gardner (Recollections of James Anthony Gardner: Commander R.N. 1775–1814)