With it being Bastille Day, one could be forgiven for taking the title to be one of the rousing but lesser known verses from
La Marseille, but it is actually a French idiom to the effect “but we digress,” which sometimes makes an appearance in English too as a turn of phrase.

From an anonymous medieval play called
La Farce de Maître Pathelin, an anti-hero and petty thief tries to confuse a county magistrate trying him for sheep-wrangling but introducing details from a second crime—to which the judge cries “but let us return to our sheep at hand.”