The Supreme Court found that a blockade was lawful under the Laws of War and found in existence a War.
Now you are, once again, desperately citing the part of an Act regarding obstruction of the courts, and action permitted to assist the marshals of the courts.
Now, instead of fighting a war, you have The Lincoln combatting obstruction of the judicial system.
The Supreme Court found it was a WAR. They proclaimed the blockade lawful under THE LAWS OF WAR.
They proclaimed the actions of the president lawful under the Militia Act.
Walt