While the discussions of the Invasion Committee were at their height during the spring and summer of 1913, I prepared a series of papers in support of the Admiralty view, but also designed to explore and illuminate the situations that might arise. They show the hopes and fears we felt before the event, what we thought the enemy might do against us, and the dangers we hoped to avoid ourselves. They show the kind of mental picture I was able to summon up in imagination of these tremendous episodes which were so soon to rush upon us. My intention also was to stimulate thought in the Admiralty War Staff, and to expose weak points in our arrangements. For this purpose I entered into an active discussion and correspondence with several of the ablest Admirals (notably Admiral Beatty, Admiral Lewis Bayly, and Sir Reginald Custance), seeking to have the whole matter argued out to the utmost limit possible. I caused war games to be played at the War College in which, aided by one or the other of my naval advisers, I took one side, usually the German, and forced certain situations. I also forecasted the political data necessary to a study of military and naval action on the outbreak of war. Various papers which I prepared in 1913 were the result of this process of study and discussion. The first, entitled ‘Notes by the First Lord of the Admiralty,’ deals with the problem of raid and invasion in general terms, and shows the conditions which would prevail in a war with Germany. The second propounds the issues to be faced by the War Staff. The third records my written discussion of the problem with the First Sea Lord, while the sittings of the Invasion Committee were proceeding. The fourth and fifth were entitled ‘The Time-Table of a Nightmare’ and ‘A Bolt from the Grey,’ imaginative exercises couched in a half serious vein, but designed to disturb complacency by suggesting weak points in our arrangements and perilous possibilities. Space forbids the inclusion of these last. The first three have been subjected to a certain compression. NOTES BY THE FIRST LORD OF THE ADMIRALTY It is much harder for the British Navy to stop raids or an invasion from Germany to-day than it was fifteen years ago from France. The tension between England and France had in the course of successive generations led to the development of a sea front opposite to France of great military strength. The line Berehaven, Queenstown, Pembroke, Falmouth, Plymouth, Portland, Portsmouth, Newhaven, Dover, Sheerness, and Chatham, covers with suitable defences every point of strategic significance, comprises three great naval bases and dockyards, and two torpedo-proof war harbours (Portland and Dover). In close proximity to this line are our three principal military establishments, the Curragh, Salisbury and Aldershot.