 The precise details of the delimitation of the section east from Tumu to the Chad tripoint remains somewhat hazy, however the convention line as currently in place appears to have been agreed upon at some time in this period.The Libya-Niger was formerly longer than it is currently, prior to the transfer on 18 March 1931 of the Tibesti Mountains from Niger to Chad.During the North African Campaign of the Second World War Italy was defeated and its African colonies were occupied by the Allied powers, with Libya split into British and French zones of occupation.