The note of his Majesty’s principal Secretary of State for Foreign Affairs, which accompanies the Order in Council, and which bears the same date, notifies the Government of the United States of the establishment of a blockade which is, if defined by the terms of the Order in Council, to include all the coasts and ports of Germany and every port of possible access to enemy territory. But the novel and quite unprecedented feature of that blockade, if we are to assume it to be properly so defined, is that it embraces many neutral ports and coasts, bars access to them, and subjects all neutral ships seeking to approach them to the same suspicion that would attach to them were they bound for the ports of the enemies of Great Britain, and to unusual risks and penalties.
It is manifest that such limitations, risks, and liabilities placed upon the ships of a neutral power on the seas, beyond the right of visit and search and the right to prevent the shipment of contraband already referred to, are a distinct invasion of the sovereign rights of the nation whose ships, trade, or commerce is interfered with.
The Government of the United States is, of course, not oblivious to the great changes which have occurred in the conditions and means of naval warfare since the rules hitherto governing legal blockade were formulated. It might be ready to admit that the old form of “close” blockade, with its cordon of ships in the immediate offing of the blockaded ports, is no longer practicable in the face of an enemy possessing the means and opportunity to make an effective defense by the use of submarines, mines, and air craft; but it can hardly be maintained that, whatever form of effective blockade may be made use of, it is impossible to conform at least to the spirit and principles of the established rules of war.
If the necessities of the case should seem to render it imperative that the cordon of blockading vessels be extended across the approaches to any neighboring neutral port or country, it would seem clear that it would still be easily practicable to comply with the well-recognized and reasonable prohibition of international law against the blockading of neutral ports, by according free admission and exit to all lawful traffic with neutral ports through the blockading cordon.