Defences of Charleston, South Carolina

Made after the evacuation, when Federal engineers could finally walk over the works and measure them. Fourteen ground plans and thirty-two profiles: this is the surveyor’s account of what four years of Confederate engineering had built, drawn by the men who had spent those years shooting at it.

Published as part of the Secretary of the Navy’s annual report to the thirty-ninth Congress — which is why a set of siege drawings ended up in a government document.