John Rushworth Jellicoe,
The Crisis of the Naval War
“ The danger which confronted the British peoples was never so great in any previous period as it was during the year 1917 when the submarine menace was at its height, and it may be hoped that the lessons to be learned from the history of those months will never be forgotten. The British Empire differs from any other nation or empire which has ever existed. Our sea communications are our very life-blood, and it is not greatly exaggerating the case to say that the safety of those communications is the one consideration of first-class importance. ”

