 Complete the following phrase:  During the summer of 1861 a four-person board, chaired by Captain Samuel F. Du Pont, was formed to study the implementation of the blockade and make recommendations to improve its efficiency. In the boards report of July 16, 1861, it was recommended that the Atlantic region be divided into northern and southern sectors. On September 18, 1861, the Navy Department reached the decision to implement this division with the dividing line being the border between North Carolina and South Carolina. The implementation of this was delayed for a time and on October 12, 1861, the Navy Department informed Flag Officer Goldsborough that the division of his command would be effective as of the date Flag Officer Samuel F. Du Pont, who was appointed commander of the southern squadron, departed from Hampton Roads with the expedition to 