[PeaRidge]

You are confusing an un-addressed, un-signed, scribbled message on plain paper to a senior government official, through a low level governmental operative as a final order?

Fox's order plainly stated that his mission was to reinforce Ft. Sumter.

Show Lincoln's direct order that countermanded his written order of April 4.

[BroJoeK]

PeaRidge: "You are confusing an un-addressed, un-signed, scribbled message on plain paper to a senior government official, through a low level governmental operative as a final order?"

Certainly Lincoln's telegraph to South Carolina Governor Pickens on April 6, 1861 reflected his orders of that same date to his Fort Sumter relief commanders.

PeaRidge: "Fox's order plainly stated that his mission was to reinforce Ft. Sumter.
Show Lincoln's direct order that countermanded his written order of April 4."

This site lists a whole series of orders, including the April 4 you've quoted, but also orders from April 6, which support Lincoln's message to South Carolina Governor Pickens.

"The primary object of the expedition is to provision Fort Sumter, for which purpose the War Department will furnish the necessary transports.
Should the authorities of Charleston permit the fort to be supplied, no further particular service will be required of the force under your command, and, after being satisfied that supplies have been received at the fort, the Powhatan, Pocahontas and Harriet Lane will return to New York, and the Pawnee to Washington.

"Should the authorities at Charleston, however, refuse to permit or attempt to prevent the vessel or vessels having supplies on board from entering the harbor or from peaceably proceeding to Fort Sumter, you will protect the transports or boats of the expedition in the object of this mission -- disposing of your force in such a manner as to open the way for their ingress, and afford, so far as practicable, security to the men and boats, and repelling, by force if necessary, all obstructions to provisioning the fort and reinforcing it; for in case of resistance to the peaceable primary object of the expedition, a reinforcement of the garrison will also be attempted."