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In accordance with the general principles of visit and search and destruction of merchant vessels recognized by international law, such vessels, both within and without the area declared as naval war zone, shall not be sunk without warning and without saving human lives, unless such ships attempt to escape or offer resistance.

It was not until Feb. 1, 1917, that Germany repudiated this pledge and resumed ruthless U-boat warfare. But it did give us warning that it could send its undersea craft to American waters whenever it chose.

If there ever had been any fancied security from their submarines, it was removed that Sunday, July 9, 1916, when the Deutschland bobbed up in Chesapeake Bay, and a few hours later reached her dock in Baltimore. Coming from Bremen via Heligoland, it had made its way through the North Sea and around Scotland, crossed the ocean and entered Hampton Roads under the very noses of the British cruisers just outside. Two hundred and thirteen feet long, with a displacement, submerged, of 2,200 tons, it had a surface speed of 12 to 14 knots an hour, and could run under water at 7-1/2 knots. Though unarmed, and called a "mercantile submarine," by the placing of guns and torpedo tubes aboard, she could be quickly converted into a man-of-war. The Deutschland came again to America in November, going to New London, Conn., reaching Germany, on her return, December 10. This was her last trip as a merchantman, for she was soon afterwards converted into a warship, and was one of the submarines sent to sink shipping in American waters in 1918.