playing as North Vietnam...the war goes well but the French keep retaking my ports by just unloading units from merchant marine ships...isn't this WRONG?...to invade an enemy land from the sea you should have landing crafts...merchant marine ships is only for friendy to friendly port...with that bug (??) the game is like unplayble if the enemy can land in any port like this....so is this a feature of the game or a bug?...vers of the game is 7.3.1.....