§ Commander Locker-Lampson
asked the Secretary of State for War whether he will instruct all units of defence in this country to learn to distinguish between the sound of a German aeroplane from that of a British aeroplane; and whether he will insist upon the use by night of dogs, who are the only means of finding strange troops in wooded places?
§ Sir E. Grigg
The ability to distinguish with certainty between the sounds of enemy and friendly aircraft can be attained only by continuous experience of the sounds of actual aircraft, and, in many cases, those now serving at home have had such experience. It is possible, however, that recorded sounds might be of use for instructional purposes, and I will I have this investigated. The question of the use of dogs in home defence has been carefully considered and it has been decided that their value is not sufficient to offset the difficulties which their employment entails. I would not agree that dogs are the only means of finding strange troops in wooded places.