All that we did in 1839 was to sign, together with Austria,Russia,France,Prusia and Holland, an agreement that Belgium should be a perpetually neutral state. We bound ourselves, as did the others, not to violate that neutrality, but did not bind ourselves to defend it against the encroachment of any other Power. And the Canadian Historian and Lawer Dr. Your reasoning sounds healthy but Grey used an non valid argument to get his country into the war and that was here the question.
Someone invades it, and refuses to leave.
Please show me the fault in my argument.