The Fleet was exercised during the day at battle tactics. The sweep of light forces into the Heligoland Bight which took place at dawn was successful in bringing enemy light forces to action. The official despatches relating to this operation are given in an Appendix. The events may be shortly described here. At 6.53 A.M. Commodore Tyrwhitt, commanding the Harwich force, which had swept into the Heligoland Bight during the night to cut off enemy vessels, sighted a destroyer and chased her. From 7.20 to 8 A.M. the _Arethusa_ and the 3rd Flotilla were in action with destroyers and torpedo-boats making for Heligoland, sinking one destroyer. At 7.57 the _Arethusa_, Commodore Tyrwhitt’s flagship, which had been in commission only a few days, sighted two enemy light cruisers, and engaged them, assisted a little later by the light cruiser _Fearless_. At 8.25 A.M. a hit from the _Arethusa_ wrecked the fore bridge of one of the enemy ships, and they both steamed at once for Heligoland, which was then sighted, and our ships turned to the westward. The _Arethusa_ had been considerably damaged during the action and had suffered several casualties. At 10.55 A.M. another German light cruiser was sighted by the _Arethusa_, and on being attacked by the _Fearless_ and destroyers turned away; she reappeared at 11.5 and engaged the _Arethusa_ and _Fearless_ and was attacked by these ships and by destroyers and again turned away. Meanwhile Commodore Tyrwhitt had informed Sir David Beatty of the position, and that officer proceeded at full speed to his support. The light cruiser _Mainz_ had been attacking the somewhat disabled _Arethusa_ and the _Fearless_ at about 11.30 A.M. and had suffered very severely in the action, being practically disabled. The arrival of the First Light Cruiser Squadron, under Commodore Goodenough, on the scene at about noon secured her destruction. Between 12.37 P.M. and 1.45 P.M. the 1st Battle Cruiser Squadron and 1st Light Cruiser Squadron engaged two other German light cruisers, one of which was sunk; the second was last seen burning furiously and in a sinking condition. Even thus early in the War the difference between the behaviour of British and German seamen was noticeable. On the British side, in addition to other assistance rendered to the survivors of the _Mainz_ (which had been sunk), Commander Keyes, in the destroyer _Firedrake_, proceeded alongside and rescued 220 of her crew, many of them being wounded. A German light cruiser opened fire on the British destroyers engaged in picking up survivors from the German destroyer V187 when that vessel was sunk by our craft, thus making it necessary for the destroyers to leave behind the boats carrying out the rescue work. The British submarine E4 afterwards took our officers and men out of these boats and left some unwounded Germans to take the other boats, which contained German wounded, to Heligoland.