German territory situated west of the Rhine, together with the bridge-heads, is subject to occupation for a period of fifteen years (Art.

428).

If, however, "the conditions of the present Treaty are faithfully carried out by Germany," the Cologne district will be evacuated after five years, and the Coblenz district after ten years (Art.

429).

It is, however, further provided that if at the expiration of fifteen years "the guarantees against unprovoked aggression by Germany are not considered sufficient by the Allied and Associated Governments, the evacuation of the occupying troops may be delayed to the extent regarded as necessary for the purpose of obtaining the required guarantees" (Art.