The outbreak of the Second World War in September 1939 halted their progress. After stopping briefly at Marseille they sailed on to Antibes, where they remained for more than six months, unable to gain permission to leave. There David met and became greatly influenced by the ageing writer Norman Douglas, about whom she later wrote extensively. He inspired her love of the Mediterranean, encouraged her interest in good food, and taught her to "search out the best, insist on it, and reject all that was bogus and second-rate". Cooper describes him as David's most important mentor.