Keep in mind how far inland Antwerp - its not a typical coastal port. It location makes it very very easy to mine the channel leading to it. In many ways its similar to Narvik - i.e. you can hold the port but cant use it because you mine the approach channels effectively and thus its useless.
Plus Belguim really has no need for a blue water navy with no colonies or overseas dependencies so it takes a much more brown water navy approach.
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