Today in 1915, the German Navy launched the main thrust of a major operation against the Russian (now Latvian) port of Riga, one of the Russian Navy’s most important bases in the Baltic Sea.
The attack involved about half the German High Seas Fleet, which had so far been dedicated to giving the British something to worry about in the North Sea. It was intended to neutralise the much smaller Russian force stationed in the port, and so provide support for advances taking place on the Eastern Front. In practical terms, the German plan was to clear the minefields that had protected Riga since the autumn, bombard the city and destroy its principle warships, chief among them the pre-dreadnought battleship Slava, and then block the port with German mines. It didn’t work, and for the usual reasons.
While two old battleships kept the Slava busy and the rest of the German fleet waited offshore to discourage Russian naval reinforcement, minesweepers went to work on 8 August, but were unable to clear a passage before darkness fell and the attempt was suspended. Various German fleet units were then dispatched to bombard Russian positions on small islands in the vicinity, inflicting only minor damage, before a second, more ambitious attempt to clear a passage through the Gulf of Riga opened on 16 August.
Two dreadnoughts, three cruisers and 31 minesweepers had fought their way past Russian defences by the next day, damaging the Slava in the process. By 19 August Russian minefields had been cleared, and the German force entered the Gulf. So far, so good for the High Seas Fleet, but just as the big warships were poised to complete the kind of victory that might restore their damaged fighting reputation, they fell victim to caution.
Failure to make full use of dreadnoughts and battlecruisers was bad, but losing one or more of the hugely expensive things was much, much worse, so unconfirmed reports of British and Russian submarines in the area were enough to prompt a rapid withdrawal of the entire German force on the following day. Minor damage aside, the operation had cost the German Navy two destroyers and the Russians a single gunboat. Riga would remain an operational Russian base until September 1917.
Apart from highlighting the switch in German emphasis to the Eastern Front in 1915, and once again demonstrating the Catch-22 that hobbled the great warships of the First World War, this ultimately insignificant naval battle also gives me a chance to mention another of the conflict’s forgotten fronts, the Baltic Sea.
The Baltic was the main theatre of operations for the Russian Navy, which fought a continuous battle against German units in the southern and eastern Baltic from August 1914. Russia’s main aim was to prevent German penetration of the Gulf of Finland, which led to Petrograd (as St. Petersburg was now known), but the navy was also charged with disrupting German trade to and from Scandinavia. Although redeployments from the North Sea occasionally gave German forces an advantage, they were generally outnumbered in the theatre, never had any intention of approaching Petrograd, and were primarily concerned with protecting their trade routes.
At the start of the War neither side felt confident of dominating the Baltic. The Russian fleet simply holed up in the Gulf of Finland behind a field of 4,000 mines and dared the Germans to come after them, while the Germans opted for a defensive approach and laid their own minefields. In September, having taken the measure of German naval weakness in the theatre, the Russians moved west, re-establishing bases in the Gulf of Riga and protecting them with more minefields.
This set a pattern. Major operations like that of August 1915 were the exceptions in a campaign that revolved around minelaying for the next three years. By the end of 1915, the Russians had laid about 4,000 more mines in the Baltic, including fields off the German coast, while a smaller number of German minelayers never stopped working, and both sides soon built up substantial minesweeping fleets. The main targets for mines were cargo vessels, with Russian fields in particular taking a steady toll of merchant shipping throughout the conflict.
Submarine warfare was another, albeit marginal feature of the Baltic campaign. German and Russian boats enjoyed almost no success in the theatre, but were used to some effect as minelayers. British submarines (five of them were in the Baltic by October 1915) fared better, inflicting sufficient damage on German merchantmen to prompt the transfer of several big ships from the North Sea to protect trade routes.
The unceasing battle between minelayers and minesweepers in the Baltic, with major warships watching from safe harbours, was as marginal to the War’s outcome as it was intense. It was eventually ended in late 1917 by the collapse of the Russian war effort, at which point the Russian Navy was ahead on points. Having sunk three times as much shipping as it had lost, it had escaped the eventual capture of Riga by German land forces and arrived without serious damage in the Gulf of Finland, where it lay idle when the Treaty of Brest-Litovsk ended hostilities between Russia and Germany.
Like the ‘mosquito’ war fought in the northern Adriatic, the Baltic campaign evolved into an example of modern naval war, and as such was another slap in face for pre-War naval planners wedded to the nineteenth-century doctrine of fleet warfare… and now you know it happened.