What happened is that Belgium went neutral after it's NM went to "0". Because it went neutral all former friendly units were repatriated their respective country production panels. If either CP or Entente enter Belgium hexes that would be a declaration of war by the moving party. Unlikely in SP would CP move into a neutral country (what is left of it, CP claims the rest), at least I have never seen it happen, so you are the only one who "likely" would violate Belgium's neutrality. Where Belgium has no production capability, if you invaded, they would be unable to fight back, more than likely surrender, especially if you capture the remaining Belgium hexes.. Sometimes it can be to your advantage, cause the German infantry (Antwerp is marooned), to go around neutral hexes to take out Brussels then invade Belgium to capture Antwerp. Keep in mind when you place a repatriated unit from the production panel, you can move that unit on the same turn. Placing an English unit in London for instance is allowed to disembark the same turn or fight the same turn, or move to it's fullest extent.
PS: I might be wrong about one thing: If you violate Belgium neutrality, German controlled Belgium Capital and city hexes may revert back to Belgium again, thus they would have production capability.
< Message edited by operating -- 11/29/2014 5:03:50 AM >