Belgian failure to defend her neutrality and allow the Germans through would have an impact on the ground war. The Schleiffen Plan's best case scenario was Belgium allowing German passage through to attack France. In that case, the British could conceivably also declare war on the Belgians in defense of the French.No way Léopold II accepts à German invasion. That is completely out of character.
The only reason I may find for the Belgians not resisting is if Britain lets them know they won't intervene and they are essentially on their own (like the Danish situation in WWII). Chances for doing that are quite limited barring a huge PoD IMHO
German troops in Belgium, and if the Schleiffen Plan goes undisturbed as was plan "A", and the German army gains control of the French Normandy coast prior to turning eastward to capture Paris from the rear, this would all pretty much end the British army's ability to land forces in Western Europe.
Therefore, should Britain also declare war on Belgium, I see the Royal Navy concentrating on a major attempt to blockade Western Europe, and keep the German High Seas Fleet in port, which is actually what happened anyway. Then if there is going to be a major land war against Belgium and German forces, I see British sending large forces to possibly invade the Belgian Congo in Africa from either and or both the Sudan and Rhodesia. Germany would be forced to have to defend German East Africa, but with most of their forces needed to complete the Schleiffen Plan wth a long war in Eastern Europe against Russia, they would be out numbered.
The logistics would be hard, and the war would definitely be a long one in order for the British to plan and execute such a military plan, but I see few alternatives. If they sent a large number of land forces to the Eat the east to aid Russia against the Germans, Austro-Hungarians, and the Turks and Bulgarians, the Germans and Belgium would still have access to the the Belgian colonies for raw materials to supply their war machine. (Basically Germany's.)
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