He had seen two of the prisoners marking out the whitewashed lines on the tennis court where the German officers played each day. The lines were made by the use of two narrow wooden boards, eighteen feet long, fastened together by crosspieces, allowing a small space of about two inches between. While the boards seemed very light, they were so fastened together that they were really quite strong. They could be made even stronger by nailing on more cross-pieces. Then they would form a sort of bridge over which the men could crawl from the barracks' windows to the outer fence, where they could drop to the ground and run from the sentinels.

For months the men gathered their necessary materials together. Many of the prisoners, who were not to try to escape, were let into the secret and helped as much as they could. They drew the screws out of the doors and windows, and brought strips of wood from broken provision boxes with which to finish making the bridges.

Best of all they secured three pairs of wire cutters, one from a Russian prisoner, and a second from a Russian attendant. The third pair was made by one of the prisoners.

This secret collection was a constant source of danger, as the prisoners were searched nearly every day. It is said that one prisoner was given solitary confinement because a map was found sewn in the seat of his trousers. Therefore, much of the work, such as bringing the boards into the barracks and nailing the bridges together, was left until the last. A month before they were to escape, they were suspected and the guard was doubled. Still they worked on and hoped on.

Their plans were nearly completed when it was suddenly announced that the camp at Villingen would be used in the future as a prison for Americans only. All other nationalities would be transferred at once to some other camp. This, the prisoners knew, would mean first a thorough searching of every corner and crevice in camp. Thus it seemed necessary to break away at once before this careful inspection should be made, or they probably could not escape at all that winter.

For two days they worked steadily and carefully. Night was their best time to escape, but somehow the electric lighting system, as well as the electric current in the wire fences, must be shut off. To do this, it was necessary to find strips of wire for making short-circuiting chains. A few of these strips they cut from the fencing back of the tennis courts. Most of them, however, were taken from the steep prison roof where they were used to hold the slate tiles in place. Nearly all of these wires were drawn out, so that if a whirlwind had suddenly swept across the country, that roof would have been scattered in every direction.

All this had to be done very quietly. One or two would work at it while others attracted the attention of the Germans by creating some excitement in distant corners of the camp.

The night before the camp was to be inspected, the break was made. The sixteen men were divided into four groups of four each, one in each group acting as a leader.

The first group, with Lieutenant Isaacs leading, was to get over the two fences from the windows by crossing on the bridges. The second group, led by Lieutenant Willis, was to cut its way through the wire fences. The third had ready some ladders made of strong rope, by which they hoped to climb over the fences. The last group intended to rush out with the guards when they ran through the gates to catch those who were jumping from the bridges.

At 10:30 that night, a signal was given and everything followed like clockwork. One of the prisoners short-circuited the wires, shutting off the electric lighting system and the current in the wire fences. There was no moon, and the camp was left in utter darkness.