Not military, but political. The British had not signed any treaties guaranteeing either Denmark's or Vichy France's neutrality.I
I repeat my question, why were the military reasons of breaking the Neutrality of Denmark and Vichy France higher, then the miltary reasons of breaking the neutrality of Belgium, even if this treaty was 75 years old and the borderlines were totaly different at the timeline of 1839 then 1914 and the military circumstances also totaly different.