I proposed a solid basis for the new, post-war Europe: Germany permanently bounded on the west by the Rhine, and the Rhine held by a small Allied for… - Ferdinand Foch

The Rhine is to-day a barrier indispensable to the safety of Western Europe—indispensable, therefore, to civilization. ... By renouncing the Rhine as a natural barrier, we should be conniving at an inconceivable, a monstrous situation. Germany would be able to continue her enterprises as though she had been victorious—the very Germany that has sent millions of human beings to death, the very Germany that planned to annihilate our country and leave her a heap of ashes, the very Germany that plotted to dominate the world by brute force—blood-stained, crime-stained Germany.

A war not only arises, but derives its nature, from the political ideas, the moral sentiments, and the international relations obtaining at the moment when it breaks out. This amounts to saying : try and know why and with the help of what you are going to act; then you will find out how to act.

The Rhineland question is controlled by the Rhine. The river is the deciding factor. The master of the Rhine is the master of the surrounding country. Whichever side does not control the Rhine has lost.