While reading " The Battle File" by Sidney Shail, I came across this mention: Also working under the auspices of the AASF was the curious "M" Balloon Unit. Its function was to release small balloons carrying propaganda leaflets towards Germany. The leaflets were released by the action of a burning fuse . Not having heard of this unit I did a search and found some excellent information on psywar.org. http://www.psywar.org/psywar/reproductions/mballoon.pdf http://www.psywar.org/mopbook.php Thanks to Lee Richards for the excellent site and the information on an obscure unit serving in 1940 France.