2782421 Senegalese tirailleurs ambushed and massacred by the Wadai at Abeche, Chad (colour litho) by French School, (20th century); Private Collection; (add.info.: Senegalese tirailleurs ambushed and massacred by the Wadai at Abeche, Chad. The Wadai, or Ouaddai, Empire was a kingdom that ruled an area to the east of Lake Chad from the 16th Century until they were conquered by the French in 1912. Surprise Et Massacre D\'Une Compagnie De Tirailleurs Senegalais A Abecher, Le Guet-Apens De L\'Ouadai. Illustration for Le Petit Parisien (Supplement Litteraire Illustre), 6 March 1910.); 穢 Look and Learn.