This happened in 2015, while I was being Canadianized.
A Free Syrian Army commander named Majid Khayba, better known by his assumed moniker of Abu Ali Khbayeh, was tied to a cross and executed by FSA competition Jaish al-Islam. Abu Ali Khbayeh is best known for stating in 2013 that Syrian President Bashar al-Assad was killed by the mujaheddin, and for laying siege on the city of Douma, and occupying its citizens.
BTW, anybody else read the piece in the Financial Times which states that the CIA was not only training and arming the insurgents in Syria, but was paying them salaries? Meanwhile, the government of Syria formally petitioned the UN to make the US pay reparations for its illegal destruction of Syrian infrastructure and the deaths of countless civilians.
Props to Best Gore member @rann19 for the video: