![](https://images.gutefrage.net/media/default/user/12_nmmslarge.png?v=1551279448000)
![](https://images.gutefrage.net/media/default/user/14_nmmslarge.png?v=1551279448000)
Antwort
Weil Belgien neutral war, diese Neutralität war 1830 auf der Londoner Konferenz auch von allen Grossmächten garantiert worden.
Wayback Machine (archive.org)
ARTICLE V
Belgium, within those limits that shall be determined and traced, conformably to the arrangements laid down in Articles 1, 2, and 4 of the present Protocol, shall form a perpetually neutral State. The five Powers guarantee it that perpetual neutrality, as well as the integrity and inviolability of its territory, within the above-mentioned limits.
ARTICLE VI
By a just reciprocity, Belgium shall be bound to observe the same neutrality towards all other States, and not to make any attempt against their internal or external tranquility.
Belgien war also vertraglich zur Neutralität verpflichtet.