Dark clouds forming
I'm not a great believer in decisive battles or moments that changed history, it's all much too complex for that, nevertheless, like saying "What if?", it's fun to spot them.
Everyone points to Princip's shots in Sarajevo as being the trigger to WWI, but things weren't inevitable from that point on. A stronger argument can probably be made for what a couple of stupid self-centered old men did 100 years ago tomorrow as being a more significant point.