The years 1920 and 1921 have been filled with excursions and with threats of excursions by the French Army into Germany east of the Rhine. In March 1920 France, without the approval of her Allies, occupied Frankfort and Darmstadt. In July 1920 a threat to invade Germany by the Allies as a whole was successful in enforcing the Spa Agreement. In March 1921 a similar threat was unsuccessful in securing assent to the Paris Decisions, and Duisberg, Ruhrort, and Düsseldorf were occupied accordingly. In spite of the objections of her Allies France continued this occupation when, by the acceptance of the second Ultimatum of London, the original occasion for it had disappeared, on the ground that so long as the Upper Silesian question was unsettled, it was in the opinion of Marshal Foch just as well to retain this hold.[31] In April 1921 the French Government announced their intention of occupying the Ruhr, though they were prevented from carrying this out by the pressure of the other Allies. In May 1921 the Second Ultimatum of London was successfully enforced by a threat to occupy the Ruhr Valley. Thus, within the space of little more than a year the invasion of Germany, beyond the Rhine, was threatened five times and actually carried out twice. We are supposed to be at peace with Germany, and the invasion of a country in time of peace is an irregular act, even when the invaded country is not in a position to resist. We are also bound by our adhesion to the League of Nations to avoid such action. It is, however, the contention of France, and apparently, from time to time, that of the British Government also, that these acts are in some way permissible under the Treaty of Versailles, whenever Germany is in technical default in regard to any part of the Treaty, that is to say, since some parts of the Treaty are incapable of literal fulfilment, at any time. In particular the French Government maintained in April 1921 that so long as Germany possessed any tangible assets capable of being handed over, she was in voluntary default in respect of Reparation, and that if she was in voluntary default any Ally was entitled to invade and pillage her territory without being guilty of an act of war. In the previous month the Allies as a whole had argued that default under Chapters of the Treaty, other than the Reparation Chapter, also justified invasion. Though the respect shown for legality is now very small, the legal position under the Treaty deserves nevertheless an exact examination. The Treaty of Versailles expressly provides for breaches by Germany of the _Reparation_ Chapter. It contains no special provision for breaches of other Chapters, and such breaches are, therefore, in exactly the same position as breaches of any other Treaty. Accordingly, I will discuss separately default in respect of Reparation, and other defaults. Sections 17 and 18 of the Reparation Chapter, Annex II. run as follows: