How did the union blockade of the southern coast affect the confederacy during the civil war?

Confederate defensive strategy, in turn, evolved with the Union blockade. After the fall of Port Royal, South Carolina, in November 1861, Confederate president Jefferson Davis appointed General Robert E. Lee to reorganize Confederate coastal defenses. Lee quickly realized the impossibility of defending the entire coastline and decided to consolidate limited Confederate forces and materiel at key strategic points. He countered Union naval superiority by ensuring easy reinforcement of Confederate coastal positions along railroad lines. In this way, Lee minimized reliance upon the fledgling Confederate navy and maximized the use of Confederate military forces in coastal areas, including both Georgia's Sea Islands and mainland ports with railroad connections.