Timeline: Unrest in Syria

Published On: Dec 24 2013 03:19:21 AM CST   Updated On: Sep 23 2014 09:32:18 AM CDT

The U.S. and several Arab nations have begun airstrikes in Syria -- the latest chapter in a bloody civil war. Learn about the major events in the country's tumultuous uprising.

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Thomas Evans/CNN

May 19, 2013 -- Hezbollah, a long-standing ally of Syria, sends thousands of men to support Assad forces and fight against the rebels in parts of the strategic border town of Qusair.

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