On landing at Wilhelmshaven, Isaacs was questioned by German intelligence officers, and then sent to Karlsruhe where he was again examined with the hope that he would give out information which would be valuable to the Germans. Here with several other prisoners, he was held for three days in a "listening hotel" where dictographs had been strung about the room. The German officers hoped that, left without guards in the room, the prisoners would talk over military matters, not knowing that the dictographs were there to record all that was said and thus reveal all to the Germans. But the prisoners expected some trick, discovered the dictographs, and pulled out the wires so that they would not work.

Isaacs remained in Karlsruhe for some time, then was placed on a train with several officers and started for the prison camp at Villingen in Baden. At Karlsruhe he had been shamefully treated and he determined he should never arrive in Baden.

On the train he was put in the charge of two guards and so closely was he watched that he despaired of having any chance to escape. But within five miles of his destination, he noticed that one guard became drowsy, while the other had his attention on the passing landscape.

Then it was, with the train running forty miles an hour, that he jumped to his feet and dived through the little car window. He landed on his head and knees on the opposite track. Although badly stunned, he struggled to his feet and began to run. By this time the train had been stopped and the guards were pursuing, firing as they came on. Isaacs went some distance but could hardly run for he had badly injured his knees. A bullet whistled by his ear and he dropped and let the guard come up to him.

Mad with rage the German kicked him, and beat him with his gun until he broke it. The rest of the guards soon came up. Then they made Isaacs walk the five miles into Baden, beating him now and then on the way.

On reaching the camp he was first taken to the officers' quarters and threatened with death if he tried again to escape. After being plastered with paper bandages he was put into solitary confinement for three weeks. So poor was the prison food that had it not been for the nourishment furnished by the American Red Cross, Isaacs never would have recovered.

He had been threatened with death if he tried again to escape, but he began at once to make plans and would have gained his liberty much sooner than he did, had not the Russian prisoner attendants each time betrayed his plans before he could try them. And now he and Lieutenant Willis with fourteen other men decided to try again for freedom.

The prisoners were sometimes permitted to take walks with the guards about the country. In this way the men who were to escape were able to learn about the roads and the best hiding places. They managed to secure maps and compasses by bribing some of the Russian attendants.

But these would only be of help when once outside the camp, and how to get out was a serious question. Some believed that the best way was to get past the guards through the big gate. To climb over the two wire fences, so heavily charged with electricity, seemed entirely impossible.

But Isaacs discovered a way across that barbed wire.