改编自扬子江事件,二战结束后紫石英号被编入英国远东舰队,驻扎香港。1949年4月20日,紫石英号在此之前我国已经发布渡江战役公告,令各国船只撤离长江。
While sailing lawfully up the Yangste river in 1949, the British warship Amethyst found its return to the open sea blocked by Communist Chinese shore batteries that unexpectedly opened fire. In charge, Lieutenant Commander Kerans was not however prepared for his crew and his ship to remain as a hostage for the Chinese to use as an international pawn.