Book music/song/text the washing on the Siegfried line 1940

"We're Going to Hang out the Washing on the Siegfried Line" is a popular song by Ulster songwriter Jimmy Kennedy, written whilst he was a Captain in the British Expeditionary Force during the early stages of the Second World War, with music by Michael Carr. The Siegfried Line was a chain of fortifications along Germany's Western border, analogous to the Maginot Line in France. The song was used as a morale-booster during the war, particularly up to and during the Battle of France