Again , Hartmann proved successful , sinking three ships ; the Norwegian Tosca , the Swedish Sveaborg and the British Stancliffe .
U-37 departed Wilhelmshaven on 30 March for Werner Hartmann 's third consecutive patrol , this time around Norway .
Werner Hartmann proved successful , sinking three ships ; the Norwegian Tosca , the Swedish Sveaborg and the British Stancliffe .
U-37 departed Wilhelmshaven on 30 March for Werner Hartmann 's third consecutive patrol , this time around Norway .