The British decision to not help in order to be able to trick the Germans later indicates that Greece truly isn't a country that matters to any of its allies on the international stage. Gandin's unwillingness to attack the Germans reminds the reader that he is trying to be an honorable person and do the right thing, but his unwillingness to fight Barge's nastiness with equal nastiness will be his downfall. In other words, in times like this, the only way to win is by embracing the horror of war.