How a modern-day massacre happened — and why America sat on the sidelines. In December, after an extended siege and a month of intense fighting, Bashar al-Assad’s forces seized control of the rebel-held eastern half of Aleppo. A withdrawal agreement allowed thousands of rebels and civilians to evacuate — but not before Assad’s forces massacred and tortured an unknown number of people. The Assad victory was a humanitarian disaster and a devastating blow to the embattled anti-government rebels — and something that was in the works for over a year. The above video explains why. Subscribe to our channel! goo.gl/0bsAjO aleppo syria civil war middle east russia assad Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: goo.gl/IZONyE Follow Vox on Twitter: goo.gl/XFrZ5H Or on Facebook: goo.gl/U2g06o