Why did Assad fall so quickly?

The end was “as amazing as it was quick,” said Rania Abouzeid The New Yorker. Less than two weeks after it launched a lightning strike from its stronghold in northern Syria, the rebel group Hayat Tahrir al-Sham (HTS) succeeded this week in ending the 24-year rule of President Bashar al-Assad.

The regime had pledged to defend the capital, Damascus, with a “ring of steel”; but in this case the rapid southward advance of the rebels met with little resistance. Regime soldiers abandoned their posts, leaving uniforms and equipment strewn on the street, while Assad and his family fled the country.