Leigh appeared with Robert Taylor, Lionel Barrymore and Maureen O'Sullivan in "A Yank at Oxford" (1938), which was the first of her films to receive attention in the United States. During production, she developed a reputation for being difficult and unreasonable, partly because she disliked her secondary role but mainly because her petulant antics seemed to be paying dividends. After dealing with the threat of a lawsuit brought over a frivolous incident, Korda, however, instructed her agent to warn her that her option would not be renewed if her behaviour did not improve. Her next role was in "Sidewalks of London", also known as "St. Martin's Lane" (1938), with Charles Laughton.