This exploration of Tibesti marked the end of the long journeys that had been indispensable to the acquisition of a general knowledge of the vast desert regions placed under my authority. The calculation of my numerous observations, the making of general maps, the setting in order of my notes of travel, and the writing of reports to be sent to the Government occupied all my leisure in 1916. There was not much of it, by the way, for distant effects of the world-war were already beginning to be felt in Africa. The Grand Senoussi, Ahmed Sherif, was lending a more and more willing ear to the suggestions of Nouri Bey’s Turco-German mission, and sending one emissary after another to preach revolt to the different sultans responsible to the French and British authorities; his exhortations were particularly well received in Dar Four and in the south of Wadai, where the English Colonel Kelly and the French Colonel Hilaire had to do some serious fighting before they could restore order. In the desert country I had charge of, the unrest had become almost general among the nomads, and my camel-corp patrols had hard work to maintain the regularity of our communications: there were rumours of a great expedition of Germans, Turks, and Senoussists, with cannon, machine-guns, and five thousand fighting troops, which was said to be forming at Koufra to cross the Libyan desert and drive the French from Borkou, Tibesti, and Ennedi. We made superb defensive preparations, but no expeditionary force from Koufra ever came; what did come to reinforce the rebels were brigands and highway robbers who made the roads unsafe, and whom we had to pursue in all directions more or less. Among the most remarkable of the expeditions of this period two deserve special mention: they were led by Adjutant Amboroko, an old black non- commissioned officer whose energy, courage, and high spirit won universal admiration.