@YazzyT It depends on the situation. If the British Army is cut off, then there must be a benefit in the game to withdrawing it to England. If it's not cut off, then why evacuate? I suggest that you place the player on the horns of a dilemma. The Allies need the British Army (Was it called the BEF in the Second World War?) to have a chance of holding off the Germans. But if they lose too many units and France falls, then Britain is open to invasion. So there should be some sort of penalty for losing British units, which I think is the simplest solution. That might involve a house rule around the victory conditions, or perhaps the programmer lords can work out a solution using Lua. Regardless, I think it's a grand idea for a scenario.