I stressed the importance always attached by Moltke to the Rhine question. I summarized his principle thus: ‘The bone of contention between Paris and Berlin is the Rhine; whichever holds the river is certain of dominating the other.’ ... To keep the 1914 frontier open to a menace aggravated by the destruction of Russia, and to expose France once more to the devastation she has suffered during the last five years, would be a crime against our country. There is only one remedy: the occupation of the Rhine.
— FERDINAND FOCH