IMHO it would be a form that the Entente have to give up the Dover Barrage and supply their troops using a longer trip. Because if the Royal Navy is gone it does not mean that the HSF automatically gains control over the North Sea, rather the reverse of the original status. Now the Entente have to pull back to their coastal waters to have a fighting chance against a numerically superior enemy. Sure the threat of the Thames Estuary and/or the Dover Barrage might be enough to change the balance on the continent, but it is still a long way till the Germans can convert it to actually winning the war.
I wouldn't expect that the Germans would attempt to force their way into the Thames Estuary or the Dover ports. All they need to do is intercept shipping headed to France from anywhere on the Atlantic coast.
I agree with a lot of these points, but there are other things which need to be considered. Let us suppose that the Germans achieve a great victory over the Royal Navy and shatter its Battleship fleet and its ability to maintain supreme control over the North Sea and German ability to sail into the Atlantic.
The first point to consider is that the UK was in no way as dependent as Germany on the import of many goods. The UK did import many grain products from overseas it was was more productive than Germany in terms general agriculture
For example Britain was both more productive despite being a smaller nation in terms of many sectors, the most important of which are agriculture are probably those of agriculture and construction (where the UK was more productive). What was actually seen in the UK was that agriculture had shifted with imports focusing on grain, wheat and potatoes and home production focusing on meats and dairy produce. There is already historical precedence for the UK agriculture sector being able to absorb a drop in imports in this sector - in 1916 the US harvest was particularly poor, yet by 1918 UK home production of grains and potatoes had grown by around 1/3 while the meat/dairy had shrunk by a proportional amount [1,2]. That is, the UK was more robustly able to absorb changes in world markets and import situations.
To be decisive for the prospects of the war, the Germans don't really have to blockade things trying to get tothe UK - what they need to do is ensure that things the UK is trying to get to France either don't make it, or only arrive via such a circuitous route that they aren't very useful. From the German perspective, it doesn't matter what the UK is doing on/in it's island, because they can effectively prevent them from usefully participating in the war just by preventing the flow of supplies and manpower to their armies on the continent.
Now, lets entertain the idea that Germany forces on the RN a defeat which reverses the situation ... that is the Grand Fleet does not leave its harbors for the remainder of the war. Would Germany be able to impose a blockade of similar severeness as the UK? Probably not - in the first instance, the UK was able to blockade at range, closing the north sea and English Channel, where all of the German import docks were established along a single coast. To do so, Germany would have to close off the entire Atlantic something that would be logistically a challenge and would force German forces to 'disperse' their strength - that is, battleships/cruisers acting in isolation could be forced to fight strategically disadvantaged actions. So yes, Germany could have an effect, but no they would not cut off trade as completely as the UK was able to.
The other consideration is that the German fleet wasn't really a High Seas fleet ... it was a North Sea Fleet. The ships were principally coal powered and given that Germany had no overseas bases from which to conduct coaling operations, their forrays into the Atlantic would have been relatively short, before they need to sail back to Germany and re-load. That is, sailing into the middle of the Atlantic already uses about 1/3 of their sailing range.
The principal area that the Germans would want/need to disrupt transport through would be the Bay of Biscay, and the Atlantic approaches to the English Channel. This would be sufficient to block shipping coming in to France from the New world. This shipping was critical for France, and for the UK as vast quantities of food and war material were shipped directly from the New World, to the continent via this route. They couldn't reasonably cut off transport through the French Mediterranean ports, but shipment overland from this area to the critical areas around Northeastern France would be far more of a challenge for France than the real life transport from the Atlantic and Channel ports to the front lines was.
The idea that Germany might disrupt shipping in the English Channel is also a little erroneous. There was one of the worlds largest destroyer fleets stationed in the channel (Dover I think) and were highly effective at engaging battleships (with Torpedos) in constrained waters. The German destroyer torpedo volley was one of the things which helped to cover the German high seas fleet as it disengaged.
I wouldn't expect the Germans would blockade that part/end of the Channel with capital ships. Instead, their battlefleet would be split into 2 or even 3 parts/stations - one part in the Bay of Biscay and Atlantic approaches to the Channel preventing shipping from getting to France via the Atlantic, and for torpedo boats, destroyers and submarines to be patrolling the north sea approaches and English channel proper. The other portion of the German battlefleet would be at home port, ready to relieve the 'active patrol' portion in the Atlantic approaches, and to sail out and 'cover' the small ships enforcing the blockade in the channel proper if necessary. If a 3 part split is possible, the 3rd part would be conducting harrassment of coastwise trade around the UK which was considerable. I doubt the Germans could maintain a 100% effective 'close blockade' of the entire channel, but they could certainly make life miserable for anyone trying to get across. Instead of large organized convoys going from the UK to France on a regular basis, think individual ships dashing across under cover of night, large troopships and transports being individually watched and sunk by dedicated subs, constant harrassing gunfire and torpedo attacks on blockade runners, and a never ending struggle to get vital ammunition and supplies to the British armies on the continent. The Germans wouldn't ever try to go as far as the mid Atlantic.
[1] THE UNITED KINGDOM DURING WORLD WAR I: BUSINESS AS USUAL? Stephen Broadberry 2003.
[1] “Anglo-German Productivity Differences, 1870-1990: A Sectoral Analysis”, European Review of Economic History 1, 247-267.
I think that this is the crux - a German victory would be bad, but not the end of allied operations. The high seas fleet was actually a North Seas fleet. Germany did not have the overseas logistics to sustain such a world-wide fleet as the Anglo-Americans operated. Even if they win, they gain superiority in the North Seas but struggle to project their power anywhere that would have a decisive impact.
I mostly agree, but think the Germans could do a somewhat effective job of intercepting materials headed to France via the Atlantic and the UK. Given how closely matched WWI was at many times, this could have had a decisive impact. Of course it requires the Germans to beat the high seas fleet, which had no realistic chance of taking place.
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