Almost the first war measure of Abraham Lincoln was to declare the ports of the Confederacy in a state of blockade. At first this seemed a rash proclamation, and one which could not be sustained by the force at the command of the Federals. It is a rule of warfare, that "blockades, to be binding, must be effective;" that is, it is not lawful for a nation with a small fleet to declare an enemy's coast in a state of blockade, and then capture such trading-vessels as may happen to run in the way of its cruisers. The nation must have a large enough fleet to station vessels before each of the principal harbors of the enemy, and to maintain a constant and vigilant patrol up and down his coast. If this cannot be done, the blockade is called a "paper blockade," and merchantmen are justified in attempting to evade it. An instance of a "paper blockade" occurred during the early months of the civil war, which will illustrate this point. Wilmington, N.C., was throughout the war one of the favorite ports for blockade-runners. From its situation, the many entrances to its harbor, and other natural advantages, it was the most difficult of all the Southern ports to keep guarded. With the rest of the Confederate ports, Wilmington was declared blockaded; but it was long after, before a suitable blockading-fleet was stationed there. In July, 1861, the British brig "Herald" left Wilmington without molestation. When two days out, she ran across a United States man-of-war, that promptly captured her. The courts, however, decided that a port so little guarded as Wilmington was at that time could not be legally called blockaded, and the brig was therefore released.