Source, in full
Message as a member of the French resistance, to his superiors in London, insisting that certain codewords "The library is on fire" be changed after a disastrous parachute drop which set a forest on fire and alerted the Gestapo to the location of his group of Maquis fighters, as quoted in René Char : This Smoke That Carried Us : Selected Poems (2004) edited by Susanne Dubroff