In 1950 the American-owned Isbrandtsen Steamship Line was engaged in trading along the China Coast and in entering certain Chinese Communist-held ports. The Chinese Nationalist Navy was attempting to prevent entry by any ship into Chinese Communist Ports. This situation was under general surveillance by both the U. S. and British Navies, but no active patrolling or control was undertaken until the Isbrandtsen Lines announced that their ship, Flying Arrow, would enter Shanghai. At this point, both the United States and Great Britain established destroyer patrols off Shanghai.
Assumption of Responsibility - Essence of Command
By Capt. W. P. Mack, USN