Belgium allows Imperial German army through?

Because the Germans would hold a shipping lane on their side of the channel open for warships those longer supply lines more vulnerable to interdiction by uboats and surface ships. ITOL the Germans only stationed small coastal uboats in Belgium, and these operated not far beyond the Dover mine barrage, but ITTL larger patrol uboats could be based on the far side of the Dover narrows and operate deep into the channel. The RN/NM would have to expend resources to protect these longer supply lines, which again would come from the resources that IOTL were deployed in the trenches.
If Britain enters the war then it's first act is going to be seizing the channel ports before the Germans have a chance to properly fortify them, rather than place the B.E.F. in the field alongside the French Army.
 
If Britain enters the war then it's first act is going to be seizing the channel ports before the Germans have a chance to properly fortify them, rather than place the B.E.F. in the field alongside the French Army.

Why is that? Why would the plan be different from OTL?
 
OTL the British were unable to do anything about the channel ports because the BEF was fully engaged alongside the French long before the Germans reached the sea. Here Britain's entry into the war is likely to be delayed for some weeks. Britain NEEDS the channel secure to support an army in France. For the Channel to be secure it NEEDS control of both sides of the Straights of Dover so before it can send the BEF to France it HAS to secure the Channel Ports. Without Belgian resistance then the Germans will be into Northern France in days and either pushed the French out of the ports altogether or have them penned up while they deal with the rest of the French Army in the field. The BEF will either take or garrison those ports supported by the Channel Fleet while Britain mobilises. In the meantime the territorials and recalled reservists will gradually replace the BEF which will redeploy to the Somme in support of the French (Provided they haven't lost Paris and collapsed).
 
If Belgium allows Germany through then maybe thrre let an agreement through that Britain can occupy the ports as a guarantee while the war rages on in return they keep out Belgium let germany in why not let another in. For Germany it keeps britain out of the war while for Britain it secures the safe knowledge that those ports remain out of german hands. Too me it’s something they can both agree on Britain can obtain their strategic goals without going to war and the germans can use Belgium without the fear of britain
 
a-map-of-the-western-front-france-in-1918-showing-the-front-lines-CT87AF.jpg

Road and rail map of OTL Western Front in late 1917 to mid 1918
 
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