This intention must, however, be made perfectly plain, for "negotiations without arms are like music-books without instruments," as Frederick the Great said.

It is ultimately the actual strength of a nation to which the opponent's purpose yields.

When, therefore, the threat of war is insufficient to call attention to its own claims the concert must begin; the obligation is unconditional, and the _right_ to fight becomes the _duty_ to make war, incumbent on the nation and statesman alike.
Finally, there is a third point to be considered.

Cases may occur where war must be made simply as a point of honour, although there is no prospect of success.

The responsibility of this has also to be borne.