I'm confused by what you mean when saying 'Tradition'?
Flanders would be the correct naming for the northern part of Belgium (Vlaanderen).
Anyway, as far as the original comment, something much worse would need to happen for it to trigger a war between these two countries. Western Europe has seen enough way the past centuries indeed ;)
True. But in this event, the potential would very likely impact all of Belgium, so there is no reason to differentiate flanders from the rest of the country. On top of that, both part of the country has suffered similarly throughout history of wars and bombs, so again there is no need for differentiation here.
There are very good reasons to differentiate the north and south part of the country on a lot of subjects since they are so different. This is not one of those reasons. Defense is a federal issue and there is no reasons to make it regional.
