The 1st Battle Cruiser Squadron, with the 1st Light Cruiser Squadron and two divisions of destroyers, left Scapa at 5.30 P.M. on the 12th, to carry out a sweep of the southern part of the North Sea. This force swept on the 13th on a broad front down to the Dogger Bank, thence to the Norwegian coast, and to the northward on the 14th in conjunction with the 2nd Cruiser Squadron (which was then prolonging the sweeping line), without sighting any enemy vessels. The battle cruisers and light cruisers took up a position on the 15th to support the cruiser squadrons on patrol, the destroyers proceeding to Lerwick to fuel.
The 2nd Battle Cruiser Squadron remained at Scapa. The 2nd Cruiser Squadron was working the N.E. corner of Area 6, and the 10th Cruiser Squadron at this period was working the south-western portion of Area No. 6. At 1.15 P.M. on October 15th the Theseus reported that a torpedo, which had missed, had been fired at her in Lat. 57.50 N., Long. 0.33 E.
On receipt of this report orders were given that the ships of the 10th Cruiser Squadron, on patrol, were to be withdrawn to the northern corner of the area, and later, at 8 P.M., orders were sent that they were to join the 2nd Battle Squadron still farther north, and to be used by the battleships (which were spread for the purpose of intercepting trade or enemy’s ships) for boarding purposes. Meanwhile the senior officer of the 10th Cruiser Squadron ships operating in Area 6 (H.M.S. Edgar) reported that he could get no reply to wireless signals from the Hawke. The Swift, with a division of destroyers, was ordered to proceed from Scapa at high speed to the last reported position of the Hawke in Lat. 57.47 N., Long. 0.12 E., to search for the ship. Two other divisions of destroyers were sent, later on, to assist the Swift. It is to be noted that a submarine had been reported off Tod Head on the Aberdeen coast at 8.30 A.M. on the 14th, but this report did not reach the Iron Duke until the afternoon of the 15th.
The Swift reported on the 16th having picked up a raft with an officer and 20 men, survivors of the Hawke, which had been sunk by a submarine in Lat. 57.40 N., Long. 0.13 W., on the 15th. Shortly after sighting the raft, the Swift was attacked by the same or another submarine (it was thought by more than one) whilst engaged in her work of rescue, and torpedoes were fired at her. Captain Wintour subsequently stated that he was only able to effect the rescue by manœuvring at high speed in the midst of the wreckage, etc., using the destroyers with him to screen his movements. His experience was an unpleasant one, as he naturally desired to remain on the spot until he had ascertained with certainty that he had picked up all the survivors, and this he proceeded to do with praiseworthy persistence, bringing them to Scapa. On the 16th reports were also received that the destroyers Alarm and Nymphe had been attacked by submarines to the eastward of the Pentland Firth, and that the Nymphe had rammed the submarine that had attacked her. Later examination of the Nymphe’s bottom by divers showed that her starboard propeller was damaged.
At 4.18 P.M. on the same day, the 16th, it was reported from one of the shore batteries that a submarine was close into the Switha entrance to Scapa Flow. The ships inside were immediately ordered to raise steam with all despatch, and the usual precautions were taken of patrolling the harbour with every available small craft, including destroyers, tugs, trawlers, drifters and picket-boats; and colliers and store-ships were as usual sent alongside the battleships, which were not fitted with torpedo nets, as a precaution.
The scene in the harbour on such occasions was a busy one. Small craft of every nature were patrolling at the sight of a periscope; all guns were manned; torpedo nets, where fitted, were placed in position; and every effort was made to ensure that the Fleet was as adequately guarded by the available patrol craft as circumstances admitted. All large ships except the repair ships Cyclops and Assistance left harbour during the night, the Iron Duke joining the 1st and 4th Battle Squadrons west of the Orkneys.
At noon on the 17th Sir Stanley Colville, who had been requested to organise a careful search for the reported submarine, signalled that a submarine was believed to be inside Scapa Flow and had been hunted, but not actually located. Reports had been received that officers and men on board several of the destroyers, and the gunboat Leda, had seen the periscope of the submarine, and that a torpedo had actually been fired at one of the hunting vessels. It was, however, ascertained subsequently that this torpedo was one which had been accidentally discharged by one of our own destroyers.
The accuracy or otherwise of these reports has never yet been determined with certainty, but many of the officers engaged in the search were convinced at the time that a submarine was actually inside, and that they had seen her. Indeed, a good many rounds were fired during the day at objects which were thought at the time to be a periscope.
The reports signalled to me convinced me that, until the matter was cleared up with certainty, and until some more absolute security against submarine attack on the Fleet at anchor could be provided, it was courting disaster to base battleships or battle cruisers at Scapa Flow. We had seen in the loss of the Hawke that enemy submarines could quite well operate in northern waters, and it was thought to be only a matter of time before they would attempt an attack on the Fleet in Scapa Flow, if indeed the attempt had not already been made.
I decided, therefore, that it was necessary to seek for a temporary base which could be used with safety whilst the submarine obstructions at Scapa were being perfected. The incident that had already occurred at Loch Ewe cast doubt on the safety of that base, since it was unprovided with any obstructions at all and the depth of water made it impossible to improvise them with Fleet resources.