2779774 Surrender of the Wadai sultan Doudmourrah to French troops commanded by Colonel Largeau (colour litho) by French School, (20th century); Private Collection; (add.info.: Surrender of the Wadai sultan Doudmourrah to French troops commanded by Colonel Victor Emmanuel Largeau. The Wadai (Ouaddai) Empire ruled a region to the east of Lake Chad from the 17th Century until it was conquered by the French in 1909. Resistance to French rule persisted until 1912. Au Ouadai. Le Sultan Doudmourah fait sa soumission au Colonel Largeau. Illustration for Le Petit Journal, 3 December 1911.); 穢 Look and Learn.