During WWII the 51st Highland Division(TA) became part of the British Expeditionary Force in 1940. They were sent to try and halt the advance of German units in France. One of the soldiers who was there, Spr Jimmy Johnstone can testify to the truth of the words in this song.
You can learn more about one of the survivor's of this battle by visiting: JamesReithJohnstone@BattleofStValery1940 on Facebook. The page has just been set up, so new images and content will be added soon. Thanks for your interest.
I have mirrored this video from Chris Wood's channel: https://youtu.be/SaaJAaEQ2a8. Thanks so much to him for making this video.