I have trouble with economic arguments. Industrial arguments, yes — if your enemy can build five times as many tanks, you lose. But if you build tanks with borrowed money, with glorified IOUs, whatever, you’ve still got tanks, and you can ask your creditors if they really want to go to war over so many scraps of paper. Of course, Germany needed gold and hard currency to buy rubber, oil, chromium, etc., but the Reichsmark was relatively hard, possibly even more so after the Anschluss, and after war broke out they could just get those resources by strong arm robbery. Maybe I’m missing something, but, as I see it, when you’re willing to go to war, finances only matter in so far as they affect military strength.
(Added) Is there a historical example of a country calling in its debts (as in “pay now or else)?