“SIR: This letter will be handed to you by Capt G.V. FOX, ex-officer of the navy, a gentleman of high standing as well as extraordinary nautical ability. He is charged by high authority here with the command of an expedition (under cover of certain ships of war) whose object is to reinforce Fort Sumter.”
Your own source puts the lie to your assertion.
Sorry, but no, Lincoln's order was "resupply-only, if..."
You can see that in the links in my posts #853 and #854 above.
Here again is the explanation: you are here talking about preliminary orders, my reference is to Lincoln's final orders dated April 6, 1861.