The main difficulty in providing a Flag officer afloat with a suitable staff is that of accommodation, and this difficulty was somewhat serious when I doubled the staff on board the _Iron Duke_. However, it was successfully overcome. The Staff was organised into two branches--Operations and _Matériel_--the former directly under the Chief of the Staff, the latter immediately under the Captain of the Fleet. On proceeding to sea, however, the work of the Captain of the Fleet became, of necessity, very largely reduced, and he joined the operational side, arrangements being made by which either he or the Chief of the Staff was always on the bridge in my absence, as we soon found under the new conditions, consequent on the advent of the submarine as an important factor in naval warfare, that it was essential that an officer should be constantly on the bridge who could take immediate action in moving the Fleet, or any portion of it, as might be required. Even so, the presence of the Commander-in-Chief was so frequently required, at a moment’s notice, owing to the swiftness with which a modern fleet moves, that I never left my sea cabin, which was under the bridge, to go to the after part of the ship when the Fleet was at sea. The duties of my Staff afloat were separated, as already stated, under two headings. This division, as is clear from the above remarks, affected their duties in harbour more than when at sea. In the latter case the two branches combined, and the whole staff became “operational.” The Staff work under these conditions was carried out in the war-room, situated under protection, below the conning tower. Here the movements of our own ships were recorded, as well as those of the enemy until we were nearing contact. All intelligence was sent from the bridge to this centre by the Signal officers, and the situation at any moment could be seen by a glance at the charts kept by the War Staff officer on duty. When we were nearing enemy vessels or enemy waters, the work was shifted from the war-room to the Admiral’s shelter on the bridge, so that the situation could be seen by me more readily; and finally, when, as on May 31st and August 19th, 1916, the two fleets were nearing touch with one another, the “plot” of the movements as reported was continually under my observation.