...lieved that the Confederates had remounted a few guns on the northeast and northwest faces. On the same evening, General Gillmore's batteries had opened fire on Sumter, and the general had informed Rear-Admiral Dahlgren that he had knocked down some four or five pieces that were observed on the more remote fronts, and this encouraged Dahlgren to attack. The nearest approach of the Monitors to Sumter was five hundr...