...ockspur island, on which Pulaski stood, was surrounded by broad channels of deep water, and the only near approach to it, on ground of tolerable firmness, was along a narrow strip of shifting sand on Tybee island . The people of Savannah, familiar with the situation, thought they were menaced by a danger as great as that of Sumter to Charleston; that even a few days' delay might permit this isolated fort t...