How did the capture of Port Royal effect Charleston from a military standpoint?

The Battle of Port Royal was one of the earliest amphibious operations of the American Civil War, in which a United States Navy fleet and United States Army expeditionary force captured Port Royal Sound, South Carolina, between Savannah, Georgia and Charleston, South Carolina, on November 7, 1861.The sound was guarded by two forts on opposite sides of the entrance, Fort Walker on Hilton Head Island to the south and Fort Beauregard on Phillip's Island to the north. A small force of four gunboats supported the forts, but did not materially affect the battle.

The attacking force assembled outside of the sound beginning on November 3, after being battered by a storm during their journey down the coast. Because of losses in the storm, the army was not able to land, so the battle was reduced to a contest between ship-based guns and those on shore.

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