By his orders, Maj. Anderson was to hold and defend all govt property assigned him by his superiors. He was defend himself and his command to the utmost of his ability, but not required to fight to the last man, i.e., he could surrender to a superior force, if required.
An officer inspecting situation at Charleston Harbor and Andersons command for the Secy of War, added specific permission for Anderson to move his command to any of the military posts he ad authority over, if he thought it necessary(in other words it was his decision to make). This permission was received and countersigned by the Secy of War.
ThWaar.