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[No] 11 [Lesson] To reduce the risk of Allied aircraft being shot down by friendly fire an enlarged Movement Liaison Section had been established in No 11 Group Filter Room at Stanmore. They transmitted by wireless telegraphy coded messages to HQ ships, FDTs and Operations Rooms on the far shore (as opposed to the home shore). When the aircraft were 10 minutes flying time from the beaches one HQ ship broadcast warnings of the approach of friendly aircraft on the Joint Forces frequency. This was particularly effective in the case of low flying aircraft but only when the messages were received and acted upon by all ships. [Topic] 
Approaching Allied Aircraft Alerts
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