On 18 November 1944, the German hospital ship "Tübingen "was sunk by two Beaufighter bombers off Pola, in the Adriatic Sea. The vessel had paid a brief visit to the allied-controlled port of Bari to pick up German wounded under the auspices of the Red Cross; despite the calm sea and the good weather that allowed a clear identification of the ship's Red Cross markings, it was attacked with rockets nine times. Six crewmembers were killed. American author Alfred M. de Zayas, who evaluated the 266 extant volumes of the Wehrmacht War Crimes Bureau, identifies the sinking of "Tübingen" and other German hospital ships as war crimes.