In November 1759, the Arundel intercepted a British slave ship, the Swift and, on boarding the vessel, Ramsay found over 100 slaves living in the most inhumane conditions. Such was the scene of filth and degradation he witnessed, that this incident was to have a lasting effect on Ramsay. While serving at sea he fell and fractured his thigh bone, and was disqualified from future service, remaining lame for the remainder of his life.