ORIGINAL: pacwar
That makes sense...as the CP player when I accepted Russia's surrender there were no Russian allies on their soil so I never experienced the process....and I understand why the Germans, as the aggressors get to keep what they captured but why would the allies voluntarily withdraw from their allies lands when that ally just pulled the rug out from under them...particularly if the ally had no way to enforce their request.
I think I know what you are talking about now... When your turn started, was Belgian NM at "0"? Not all players pay attention to NM %s right away. When it is "0" there is practically nothing the allies can do about it, except to recapture a Belgian city immediately, that might of given Belgium a NM boost, thus staving off a surrender. Whereas, you could not, you should of changed your strategy in preparation for your next turn, in other words, a strategic retreat preempting the Belgian surrender (get off Belgian hexes), avoiding repatriated units and choosing a better location for disembarking English troops. It's rare for somebody to lose Antwerp so early in the game.
I'll have to guess you were attacking superior German units with your Belgians and getting slaughtered, as a result you did not have the time to repair units or create new units without a Capital under relentless attacks by CP. Ideally, Belgium should try to hold out till reinforcements arrive, even then don't attack unless the unit you are attacking is extremely weak.