On the 28th of August occurred the first important naval action of the war, the battle of Helgoland. From the 9th of August German cruisers had shown activity in the seas around Helgoland and had sunk a number of British trawlers. The English submarines, E-6 and E-8, and the light cruiser Fearless, had patrolled the seas, and on the 21st of August the Fearless had come under the enemy's shell fire. On August 26th the submarine flotilla, under Commodore Keyes, sailed from Harwich for the Bight of Helgoland, and all the next day the Lurcher and the Firedrake, destroyers, scouted for submarines. On that same day sailed the first and third destroyer flotillas, the battle cruiser squadron, first light cruiser squadron, and the seventh cruiser squadron, having a rendezvous at this point on the morning of the 28th.
The morning was beautiful and clear, so that the submarines could be easily seen. Close to Helgoland were Commodore Keyes' eight submarines, and his two small destroyers. Approaching rapidly from the northwest were Commodore Tyrwhitt's two destroyer flotillas, a little to the east was Commodore Goodenough's first light cruiser squadron. Behind this squadron were Sir David Beatty's battle cruisers with four destroyers. To the south and west of Helgoland lay Admiral Christian's seventh cruiser squadron.
Presently from behind Helgoland came a number of German destroyers, followed by two cruisers; and the English submarines, with the two small destroyers, fled westwards, acting as a decoy. As the Germans followed, the British destroyer flotillas on the northwest came rapidly down. At the sight of these destroyers the German destroyers fled, and the British attempted to head them off.
According to the official report the principle of the movement was to cut the German light craft from home, and engage it at leisure on the open sea.
But between the two German cruisers and the English cruisers a fierce battle took place. The Arethusa was engaged with the German Ariadne, and the Fearless with the Strasburg. A shot from the Arethusa shattered the fore bridge of the Ariadne and killed the captain, and both German cruisers drew off toward Helgoland.
Meanwhile the destroyers were engaged in a hot fight. They sunk the leading boat of the German flotilla and damaged a dozen more. Between nine and ten o'clock there was a lull in the fight; the submarines, with some of the destroyers, remained in the neighborhood of Helgoland, and the Germans, believing that these boats were the only hostile vessels in the neighborhood, determined to attack them.
The Mainz, the Koln, and the Strasburg came again on the scene, and opened a heavy fire on some of the boats of the first flotilla which were busy saving life. The small destroyers were driven away, but the seamen in the boats were rescued by an English submarine. The Arethusa and the Fearless, with the destroyers in their company, engaged with three enemy cruisers. The Strasburg, seriously injured, was compelled to flee. The boilers of the Mainz blew up, and she became a wreck. The Koln only remaining and carrying on the fight.
The English destroyers were much crippled, and as the battle had now lasted for five hours any moment the German great battleships might come on the scene. A wireless signal had been sent to Sir David Beatty, asking for help, and about twelve o'clock the Falmouth and the Nottingham arrived on the scene of action. By this time the first destroyer flotilla was out of action and the third flotilla and the Arethusa had their hands full with the Koln. The light cruisers were followed at 12.15 by the English battle cruisers, the Lion came first, and she alone among the battle cruisers seems to have used her guns. Her gun power beat down all opposition. The Koln made for home, but the Lion's guns set her on fire. The luckless Ariadne hove in sight, but the terrible 13.5-inch guns sufficed for her. The battle cruisers circled around, and in ten minutes the Koln went to the bottom.
At twenty minutes to two, Admiral Beatty turned homeward. The German cruisers Mainz, Koln, and the Ariadne had been sunk; the Strasburg was seriously damaged. One destroyer was sunk, and at least seven seriously injured. About seven hundred of the German crew perished and there were three hundred prisoners. The British force returned without the loss of a single ship. The Arethusa had been badly damaged, but was easily repaired. The casualty list was thirty-two killed and fifty-two wounded. The battle was fought on both sides with great gallantry, the chief glory belonging to the Arethusa and the Fearless who bore the brunt of the battle. The strategy and tactical skill employed were admirable, and the German admiral, von Ingenohl from that time on, with one exception, kept his battleships in harbor, and confined his activities to mine laying and the use of submarines.
In the first days of the war the German mine layers had been busy. By means of trawlers disguised as neutrals, mines were dropped off the north coast of Ireland, and a large mine field was laid off the eastern coast of England. One of the most important duties of the Royal Naval Reserve was the task of mine sweeping. Over seven hundred mine-sweeping vessels were constantly employed in keeping an area of 7,200 square miles clear for shipping. These ships swept 15,000 square miles monthly, and steamed over 1,100,000 miles in carrying out their duties.