The papers, seventy pounds of them, were packed up and taken away,--with the Germans. As the men were leaving the office, they met the other spy, who was just arriving. It did not take much persuasion to make him go along too. The German Ambassador, von Bernstorff, raised a frightful uproar over this, and claimed that the papers were his. This was a sad mistake on his part, because, when the letters were opened and the plans read, he was asked to remember that he had said they were his. There was enough proof in that seventy pounds to convince even a German. Among other things there came to light their conspiracies to undermine the citizenship of other countries. But now all this was made worse than useless, for its discovery not only laid bare the plot, but also told the names of all the men who were taking part in it. It was the biggest victory scored by either side, and the credit for it goes to our regular Secret Service. Three of the heads of the German beast in America had now been cut off. There remained only von Bernstorff. He lasted nine months longer than the others. The government has not yet told the world all the details of the ambassador's last great defeat, but some were as follows-- Germany now knew that if she were to win at all, it must be immediately. So she decided to carry on her ruthless submarine warfare, and sink all the ships she could, no matter to whom they belonged. She realized that it would make America declare war on her, and in order to offset her coming in, she hit upon the idea of having Mexico attack her on the South, and if possible, Japan on the West. She did not stop to think (she had no time for that) that Japan was one of the Allies, and of course would not make war against her. Perhaps she believed Japan would not remain faithful to the Allies. So the Foreign Office in Berlin wrote to von Bernstorff in Washington, and he in turn was to write to Mexico. The success of the whole scheme depended on secrecy. The arrangements must be made without the United States knowing anything about it. Once again a heavy responsibility was thrown upon our Secret Service. How did they carry it? We have already seen that the Service had its agents in the most unsuspected places. One of the most unsuspected of them all must have gotten to work, for within a week the Service knew that something unusually mysterious was going on inside the German Embassy. Patiently the resourceful agents worked and worked, bit by bit, until at last--they won. They secured the most necessary document of the whole case, the one which Germany was most anxious to keep secret. When it was made public, it caused the greatest sensation of years. Here it is:-- "Berlin, January 19, 1917. (To von Eckhardt, the German Minister in Mexico.) "On the first of February we intend to begin submarine warfare unrestricted. In spite of this it is our intention to endeavor to keep neutral the United States of America.