On the night of 11–12 October, he volunteered to accompany British intelligence officer Captain Peter Baker across the Waal river at Tiel to contact the Ebbens family, the IS 9's mission, the last under the command of James Langley, was to deploy Operation codenamed the Windmill Line on site (The Ebbens's family farm, near the village of Drumpt), bringing back British paratroopers hidden by Dutch resistance in the Arnhem area (Ede, Netherlands) safely to the Allied lines using guides. Bachenheimer was also determined to establish telephone contact between areas of Germany and the Netherlands opposite his divisional front. But both men disobeyed a written order from Major Airey Neave (codenamed "Saturday") to remain in military uniform and not leave the safe house in daylight. They went for a walk in plain clothes and were spotted by German troops passing nearby. Operation Windmill might have been used by the British Secret Intelligence Service as a justification for a Covert operation. In addition to Bachenheimer and Baker, the other boarders at Ebbens's house were a group of young Dutchmen, a Jewish family, a wounded British paratrooper, Staff-Sergeant Alan Kettley of the Glider Pilot Regiment and Canadian military officer, Lieutenant Leo Jack Heaps (1922-1995). Heaps would be involved with Operation Pegasus, he would be later raised to the rank of Captain and awarded the Military Cross, his son is Canadian politician, Adrian Heaps.