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To embark with Captain Fox you will cause a detachment of recruits, say about two hundred, to be immediately organized at Fort Columbus, with a competent number of officers, arms, ammunition, and subsistence. A large surplus of the latter-indeed, as great as the vessels of the expedition can take-with other necessaries, will be needed for the augmented garrison of Fort Sumter.

That is consistent with an April 12, 1861 communique to the Montgomery government from Confederate General Beauregard that mentions Fox:

I have intercepted a dispatch, which discloses the fact that Mr. Fox, who had been allowed to visit Major Anderson, on the pledge that his purpose was pacific, employed his opportunity to devise a plan for supplying the fort by force.
This plan was adopted by the Government at Washington, and was in progress of execution when the demand was made on Major Anderson.
[signed] G. T. Beauregard

I have intercepted a dispatch, which discloses the fact that Mr. Fox, who had been allowed to visit Major Anderson, on the pledge that his purpose was pacific, employed his opportunity to devise a plan for supplying the fort by force.
This plan was adopted by the Government at Washington, and was in progress of execution when the demand was made on Major Anderson.

[signed] G. T. Beauregard

Thank you for posting that document. And Ditto, I direct your attention to it for its relevance to our discussion. I believe you recently suggested that no such plan was attempted.

"I have intercepted a dispatch, which discloses the fact that Mr. Fox, who had been allowed to visit Major Anderson, on the pledge that his purpose was pacific, employed his opportunity to devise a plan for supplying the fort by force."

Indeed. Fox was a "US Agent" hand picked by Lincoln. He was a former naval officer, and had naval combat experience. He personally devised the plan for the union to bull their way into the harbor and offload troops, guns, and ammunition in direct violation of every pledge made to South Carolina. In one communique he even explained how his plan was based on a European naval battle that faced numerous shore batteries like that in Charleston, and that his plan would work on the same principles. The whole deal was deceit and dishonesty from the onset. South Carolina dealt in good faith, and received treachery in return.