Le Boudin
"Le Boudin" (French pronunciation: [lə budɛ̃]), officially "Marche de la Legion Étrangère" (English "March of the Foreign Legion"), is the official march of the French Foreign Legion. "Le Boudin" is a reference to boudin, a type of blood sausage or black pudding. Le boudin colloquially meant the gear (rolled up in a blanket) that used to be carried atop the backpacks of Legionnaires.
Overview
While the tune was composed prior to the Legion's departure for Mexico in the 1860s the lyrics were progressively composed after the Franco-Prussian War, since Alsatians and Lorrains flocked to the legion after these regions were annexed by Germany. The song makes also repeated reference to the fact that the Belgians are "lazy shirkers", this come from the fact that the King of the Belgians, who wished to remain neutral in the Franco-German conflict, asked the French government to not commit the Belgian Legionnaires into the conflict. France agreed to this request and the Belgian Legionnaires remained in French Algeria (the Legion's home), to the dismay of the rest of the Legionnaires. This is why the song says that there's no blood sausage (boudin) for the Belgians. The song also mentions the Swiss who constituted the most important foreign contingent of the Legion in the 1870s.