Not every massively destructive revolt, invasion or war directly overthrew a dynasty, but the history is littered with revolts and incursions from the steppes,

Not every massively destructive revolt, invasion or war directly overthrew a dynasty, but the history is littered with revolts and incursions from the steppes, even during some of the strongest dynasties. The Tang and Qing dynasties were able to stagger through and survive two of the most destructive wars in human history, the An Lushan and Taiping Rebellions, respectively, which killed tens of millions and devastated huge swathes of the countryside, as two examples.