Most ingenious efforts were made, but despite the most rigid secrecy and the utmost caution, sooner or later in would come a search party and go straight to the scene of the excavation and often catch the diggers red-handed. It was believed that there were spies among the prisoners; at any rate everything that went on was known in the commandant's office sooner or later. The members of one party on being caught were actually complimented on their fine work by the Boches, who were full of joy naturally at having found the tunnel. For many months before we left Crefeld the Germans used to search the ground floor rooms and cellars daily. Not infrequently they would pay two or three visits to the cellars in one night. Their searching included tapping the walls, ceilings and floors for hollow places. Periodically a search for the earth excavated from these holes and hidden away, would lead to the Boches discovering many hundredweights of sand and rubble stowed away safely. Searches were sometimes made in our rooms for articles of contraband. Civilian clothes, and maps, compasses and various tools were the chief objects of interest to them. These searches on some occasions were extended to the persons of the prisoners, especially after an order forbidding the possession of real German money had been issued. Of course none of us liked being searched and we showed our searchers pretty clearly what we thought of the whole affair. I must say that the commandant did not order many searches and probably those that did occur were due to the orders of a superior. These searches were usually carried out by the under-officers and men of a different unit from that which guarded the camp, in order to prevent those who were quite friendly to us among the prison guards letting us off too lightly. During 1915 we were all inoculated and vaccinated against a number of diseases. In all we were each punctured seven times. Many prisoners objected to these measures and did their utmost to avoid being done. The German authorities caught the majority and treated them to these unpleasant attentions however. The inoculation was a comic sight. One after the other the prisoners filed past the doctors, who worked automatically at their pricking job. It often was a case of almost leather punching when the tough skins of some of the rougher types of prisoners had to be pierced. The needles were far from sharp, and I believe had to be constantly changed. Small parties of prisoners were constantly leaving and arriving at the camp. This was done, so it was generally thought, to let the people see prisoners being taken about and make them imagine that the German armies were always taking new batches.