 The two joint missions, under the command of Major Lamy of the Saharian Mission, now returned south to Joalland's base camp on the right bank of the Chari River.On 21 April 1900 Joalland and Lamy encountered the Gentil Mission, that had been proceeding from the Congo River.The following day all the French forces united clashed with the greatest ruler in the region, Rabih az-Zubayr; the French triumphed, guaranteeing the conquest of the Chad Basin.