 Complete the following phrase:  The first effort to sink the Ciudad de Barcelona had been attempted in January 1937, but the torpedo had malfunctioned. On Saturday 29 May 1937, some 200250 international volunteers boarded the ship in Marseille. They were mainly from North America, Great Britain, Germany and Italy, but some came from Scandinavia, Australia and New Zealand. There was also a group of French pilots and Senegalese passengers. Ciudad de Barcelona was intended to sail to Barcelona or Valencia, depending on situation of the 