April 11.–At early dawn I detected the presence of the floating battery on the upper end of Sullivan’s Island. It is situated between the end of the jetty and the steamboat wharf, where, evidently distrusting her qualities as a floating battery intended to breach the gorge wall at short range, she has been run on shore at high water, and, being left by the receding tide, has become a fixed battery. Her position gives her the advantage of sweeping with her guns the whole of the left flank of the fort, and thus rendering it impossible for any vessel with supplies to lie anywhere along this flank, while the breakwater in front protects her from our ricochet shots.
The stone traverse at the gorge has been raised to-day high enough to protect the main gate, and the traverse on the top of the parapet has been strengthened by the addition of sand bags on the top and sides, and braced in the rear by extra gun carriages. The communications cut through the walls of the quarters are finished, and all the water pipes and faucets prepared for use in case of fire. The third splinter-proof shelter on the right flank, barbette tier, is finished. These shelters are formed of the timbers of extra gun carriages inclined against the interior slope, and covered with 2 inch embrasure irons, securely spiked down. Shot and shells have been distributed to the guns, and about 700 cartridges reported ready. The work of making cartridge bags is slow, owing to there being only six needles in the fort.
The enemy’s steamers are very active carrying supplies and hospital stores to the batteries on Cummings Point.
At 4 p.m. three aides of General Beauregard (Colonel Chesnut, Colonel Chisolm, and Captain Lee)came as bearers of a demand for the surrender of the fort. The unanimous decision of the officers council was in the negative, and a written answer, in accordance, was returned by Major Anderson.