AUF DER GRENZE ZUM ENTMILITARISIERTEN RHEINLAND
TREATY OF VERSAILLE
Germany is forbidden to maintain or construct any fortifications either on the left bank of the Rhine or on the right bank to the west of a line drawn 50 kilometres to the East of the Rhine.
In the area defined above the maintenance and the assembly of armed forces, either permanently or temporarily, and military maneuvers of any kind, as well as the upkeep of all permanent works for mobilization, are in the same way forbidden.
In case Germany violates in any manner whatever the provisions of Articles 42 and 43, she shall be regarded as committing a hostile act against the Powers signatory of the present Treaty and as calculated to disturb the peace of the world.