The necessity of imitating the nomad in his mode of life and warfare became obvious to Laperrine from his first sojourn in Southern Algeria, where he made his career as the greatest European desert leader in history with one solitary exception. The encounter of Tit was followed by a number of “Tournées d’Apprivoisement,” patrols to “tame” the desert folk, initiated by Laperrine, and culminating in 1904 in a protracted reconnaissance through Ahaggar, which brought about a final pacification. Charles de Foucauld, soldier, traveller and monk, had accompanied the patrol. He remained on after it was over as a hermit and student among the Ahaggaren until his death in 1916. He had been Laperrine’s brother officer at St. Cyr. Extravagant, reckless and endowed with all the good things of the world, a member of the old French aristocracy in a smart cavalry regiment, the Marquis de Foucauld is one of the most picturesque figures of modern times. After a memorable reconnaissance of Morocco in 1883-4, disguised as a Jew, he became a Trappist monk, and eventually entered a retreat at Beni Abbes, in the desert that he loved too well to leave in all his life. During his years in Ahaggar as a teacher of the Word of God he made no converts to Christianity, but sought by his example alone to lead the people along the way of Truth. It is to be hoped that, in spite of a modesty which precluded it during his lifetime, the knowledge and lore of the Tuareg which he collected in the form of notes will eventually be given to the world in order to supplement his dictionary of the Ahaggar dialect, to-day the standard work on their language, which is called Temajegh.[9] To implement the Laperrine policy of long reconnaissances, a post was built near Tamanghasset in Ahaggar called Fort Motylinski, after an officer interpreter who was one of the first practical students of Temajegh. Lately the post has been moved to Tamanghasset itself, where Father de Foucauld had built his hermitage, and it is now called Fort Laperrine, in memory of the great soldier who was killed flying across the desert to Timbuctoo in 1919.