"On and after February 18, 1915, every enemy merchant vessel found in this war region will be destroyed without its always being possible to warn the crew or passengers of the dangers threatening.

"Neutral ships will also incur danger in the war region, where, in view of the misuse of the neutral flags ordered by the British Government and incidents inevitable in sea warfare, attacks intended for hostile ships may affect neutral ships also.

"The sea passage to the north of the Shetland Islands and the eastern region of the North Sea in a zone of at least thirty miles along the Netherlands coast is not menaced by any danger.

"(Signed) Berlin, February 4, 1915, Chief of Naval Staff,VON POHL."

The effect of this proclamation, which was in truth nothing more than official sanction for the work that the submarines had been doing for some weeks, and which they continued to do, was to bring Germany into diplomatic controversy with neutral countries, particularly the United States; such controversy is taken up in a different chapter of this history. In connection with the naval history of the Great War it suffices to say that such a proclamation constituted a precedent in naval history. The submarine had heretofore been an untried form of war craft. The rule had formerly been that a merchantman stopped by an enemy's warship was subject to search and seizure, and, if it offered no resistance, was taken to one of the enemy's ports as a prize. If it offered resistance it might be summarily sunk. But it was impossible for submarines to take ships into port on account of the patrols of allied warships; and the limited quarters of submarines made it impossible to take aboard them the crews of ships which they sank.

THE GERMAN SUBMARINE WAR ZONE

Reference made to the use of neutral flags quoted in the German proclamation had been induced by the fact that certain of the British merchant ships, after Germany had begun to send them to the bottom whenever one of its submarines caught up with them had gone through the waters where the submarines operated flying the flag of the United States and other neutral powers in order to deceive the commanders of the submarines. The latter had little time to do more than take a brief observation of merchantmen which they sank, and one of the first things they sought was the nationality of the flag that the intended victims carried; unless they could be sure of the identity of a ship through familiarity with the lines of her hull, they ran the risk, in attacking a ship flying a neutral flag, of sinking a vessel belonging to a neutral power.

Here was another matter that opened up diplomatic exchanges between Germany and the United States, and between the United States and England. It suffices here to give not only the controversy or the points involved, but the record of events. The first use of the flag of a neutral country by a ship belonging to one of the belligerents in the Great War occurred on January 31, 1915, when the Cunard liner Orduna carried the American flag at her forepeak in journeying from Liverpool to Queenstown. She again did so on February 1, 1915, when she left the latter port for New York. And another notable instance was on February 11, 1915, when the Lusitania, another Cunard liner, arrived at Liverpool flying the American flag in obedience to orders issued by the British admiralty. It was only the prominence of these vessels which gave them notoriety in this regard; the same practice was indulged in by many smaller ships.

"What will happen after the 18th?" was the one important question asked during February, 1915, by the public of the neutral as well as belligerent countries.

February 18, 1915, arrived and saw Von Pohl's proclamation go into effect, and from that date onward the toll of ships sunk, both of neutral and belligerent countries, grew longer daily.