“No portion of the garrison must be permitted to leave”
Beauregard telegraphed Montgomery: Captain Foster asked permission to send the civilian mechanics and laborers out of Fort Sumter, and the general was inclined to object. Secretary Walker’s answer came back the same day — no portion of the garrison must be permitted to leave unless all go. The forty-odd workmen stayed, and were still there through the bombardment.
Official Records, Series I, Vol. 1