It is true that we had two types of protection against these dangerous possibilities; first, the initiation of technical defence measures such as mines, nets and so forth, and secondly, the sharpest lookout on the part of the ships engaged in observation duties. If the enemy tried to bring on an action in the neighbourhood of Heligoland - and we assumed he would - we suffered from the outset under a disadvantage if we had to deploy for it out of the estuaries. The narrow exits from the Elbe and the Jade prescribed the line of deployment and compelled the ships to follow in line ahead, a formation which provides splendid opportunities for lurking submarines. For this reason prompt knowledge of the enemy's approach as well as his strength was of particular importance in enabling us to go out and meet him in the open sea with the necessary forces. In the first days of August we attained such a state of preparedness that all the big ships were kept under steam all day, ready to weigh anchor at any moment. We could not concentrate in the outer roads because the submarine obstructions had not yet been laid.
The time from the receipt of a report about the enemy to the issue of the appropriate orders, and then again from the first execution of those orders to the arrival at the appointed rendezvous at sea, was not inconsiderable. According to the state of readiness of the ships and the choice of anchorage it might take hours, during which the enemy would continue his approach unimpeded. Thus arose the necessity of getting the report as soon as possible. But the greater the distance from Heligoland of the arc which had to be covered by our reconnaissance and observation patrols, the less carefully could it be watched. The greater distance either demanded more ships or involved less reliable information when the line was held too thinly.
The use of wireless telegraphy came in extraordinarily handy for intelligence purposes. Unfortunately a large number of the older destroyers which had now been attached to the mine-sweeping division had not yet been fitted with this highly ingenious piece of equipment. The result was that in certain circumstances very valuable time might be lost.
The establishment of a protective system was entrusted to the Commander of the scouting forces, Vice-Admiral Hipper, and all the destroyer flotillas, U-boats, mine-sweeping divisions, aero- planes and airships were placed under his orders. From these forces a protective zone was formed which by day consisted of several circles at varying distances from the lightship "Elbe I." The outermost line, 35 nautical miles (of 1,852 metres) was held by destroyers. Six nautical miles behind there were submarines, and a further six miles back the inmost line was patrolled by mine-sweeping divisions. Two to four light cruisers were distributed behind the two wings of this protective zone, east and south of Heligoland. At night the U-boats and the destroyers on the outermost line were withdrawn, and only the inner one was held. The result of this was that we had all the more destroyers at hand for nocturnal enterprises.
This whole system, however, was more useful for protection than for reconnoitring. It did not extend far enough for the latter purpose. Even if the approach of serious enemy forces at a distance of fifteen miles was reported from the outermost line, these ships, by steaming at full speed, could be within range of the fortress of Heligoland in about an hour and a half. In that time only the ships lying in the outer Jade could gain the open sea. The ships lying in the Elbe at Cuxhaven or in the Wilhelmshaven Roads in the Jade needed longer. If we had depended on this system alone we should have found ourselves in the condition either of being surprised by the enemy and having to meet him in insufficient strength, or having to keep the whole Fleet in a perpetual state of readiness. The latter alternative was impossible in the long run. The duties of the destroyers and cruisers in the protective zone and the necessity of relieving them every few days (for the strain of this anxious service on the personnel at sea would otherwise have worn them out) absorbed such a large force of light units that their principal task of seeking out and attacking the enemy far away in the North Sea before he got to close quarters with us was seriously affected.
Our commanders were therefore faced with a many-sided problem which was made more difficult by the limited resources at our disposal : to avoid any chance of surprise, to prevent the safety of the Bight being endangered by mines or submarines in such a way that the Fleet would not have the necessary freedom of movement to get out of harbour, and finally to seek out the enemy himself in the North Sea and do him as much damage as possible by guerilla operations. It was, therefore, a very proper decision to entrust all these tasks to one commander who had to make his dispositions with an eye to wind and weather, breakdowns, injuries and the absences these involve, and question of coaling, as well as the multifarious duties laid upon him. In view of the relatively little bunker capacity of the smaller ships, it was continuously necessary to replenish supplies. Their ships' companies also suffered from heavy weather far more than those of the big ships, and therefore required relief sooner.
Nor was it a simple matter .to regulate the system of transmission of orders and intelligence by wireless in such a way as to be certain of getting messages accurately and promptly, and avoiding confusion through the operations of other stations, especially such as were in a different sphere of command.
In our situation aeroplanes and airships played a particularly important part. Unfortunately, their number was very small at the start. Heligoland was fitted up as an aviation station, but at first disposed of only five aeroplanes. The number was subsequently increased to eight. In the early days we had only the one airship, "L 3," for distance reconnaissance. The most zealous efforts were made to cruise in all kinds of weather, and so praiseworthy was the persistence shown that these cruises often extended to within sight of the Norwegian coast.
Side by side with the organisation of the protective zone, the organisation of the defences of the North Sea islands, the most important of which was Heligoland, was completed under the direction of the Headquarters of the North Sea Naval Stations, Vice-Admiral von Krosigk, at Wilhelmshaven. It was also the duty of this authority to carry out the evacuation of the native population, who did not at all like leaving their island, and arranging their transfer to the mainland. They had been previously prepared for this eventuality, and their transport presented no special difficulties. The establishment of minefields and the substitution of buoys to mark the war channels for those of the peace-time channels was also the business of the Naval Stations Headquarters.
Another of its duties was the removal of landmarks which could be seen far out to sea, and would thus be known to the enemy and might enable him to find his bearings.
One victim of this bitter necessity was the venerable old church tower of Wangeroog, the island adjacent to the Jade channel. From time immemorial it had been an object of affectionate familiarity to seafarers. It had stood so long that the whole island had gradually slid past beneath its feet, in consequence of the movement from west to east which is peculiar to the sands of the North Sea. It was now so close to the west side of the island that its walls were washed by the waves.
Harbour flotillas were formed to watch the minefields and guard the entrances to our own rivers. These flotillas were within the sphere of action of the fortresses, and therefore were likewise under the command of the Naval Stations Headquarters. The release of the Fleet from such duties definitely proved a sound idea, and thanks to the understanding and co-operation of all services, all further requirements which cropped up as time went by were generously met.
The organisation of the lightship system was of great importance. As soon as war threatened, all the lights in the lightships were extinguished, and the light-buoys removed, so that the whole coast was in darkness. It was impossible to do without lights at night altogether when cruising by the dangerous North Sea coast and navigating the strong current off the mouths of the Elbe, Weser and Ems. Further, lights that were easily recognisable had to be shown to indicate the position of the minefields and the channels through them. Yet in spite of the difficulties of navigation, darkness had the immense advantage that it enabled us to slip out unnoticed, and therefore without great risk, so that night time was preferred for such operations. Of course, the lights must not be shown a moment longer than was necessary for the purposes of navigation. Further, it must be possible for incoming ships to show their lights and be safe against any tricks on the part of the enemy. The main thing was that the light should be shown exactly at the right moment. The outer lightships at the mouths of the Jade and Elbe, which also served