Van 't Sant transferred control of the CID to Colonel Mattheus de Bruyne of the Dutch Marine Corps. Unlike Van 't Sant, De Bruyne did not have a good grasp on the subtleties of intelligence work. He failed to recognize the fact that his agents were often arrested and yet were continuing to broadcast messages, except now they were under the control of the Germans. The usual procedure for transmitting messages was to include small errors. If an agent was forced to work for the Germans, he would leave out the errors. The result should be that contact was aborted immediately. De Bruyne concluded that the agents simply forgot to use the security-checks and even sent messages to remind them. This would tip the German intelligence and he would be replaced with a German and sent off to a concentration camp. Other intelligence mistakes by De Bruyne included attaching detailed maps of the landing sites at Noordwijk, Scheveningen and Walcherento to the walls of his London office and leaving them up. Observing this, Louis d'Aulnis, an agent of the CID, elected not to announce where his landing place would be before hand, a measure which ended up saving his life.