Yvonne Ledoux was born in Châtelineau, Belgium, the daughter of a mine worker. Her family was active in the labor union movement and her childhood was full of union struggles and workers' solidarity meetings. At the outbreak of World War II, she helped rescue escaped prisoners of war and smuggle them out of the country. She met the Communist Resistance organization and began helping to create false identity papers, stamps for fuel, purchase requisition, work permits, and other documents. Much of the activity took place secretly in the attics and cellars of the Charleroi City Hall, where she worked as a city employee. She also played a major role in mobilizing women for the Resistance. She was the co-author, with Ivan Mokan and Benoît Michiels, of the memoir Partisans au Pays Noirs (Partisans of the Illegal Country), published in 1995.