"And, further, shall we be sure of finding the left bank free from German troops? Germany is supposedly going to undertake to have neither troops nor fortresses on the left bank and within a zone extending 50 km. east of the Rhine. But the Treaty does not provide for any permanent supervision of troops and armaments, on the left bank any more than elsewhere in Germany. In the absence of this permanent supervision, the clause stipulating that the League of Nations may order enquiries to be undertaken is in danger of being purely illusory. We can thus have no guarantee that after the expiry of the fifteen years and the evacuation of the left bank, the Germans will not filter troops by degrees into this district. Even supposing they have not previously done so, how can we prevent them doing it at the moment when we intend to re-occupy on account of their default? It will be simple for them to leap to the Rhine in a night and to seize this natural military frontier well ahead of us. The option to renew the occupation should not therefore from any point of view be substituted for occupation. It will then be simple for them to leap to the Rhine in a night and to seize this natural military frontier well ahead of us."