a Since early 2013, the FSA has been decentralized with their name being arbitrarily used by various rebels. b Turkey has provided arms support to the rebels since 2011. Since Aug. 2016, Turkey has fought alongside the TFSA in Aleppo governorate against the SDF, ISIL and later the Syrian government. c Sep. –Nov. 2016, the U. S. fought alongside the TFSA in Aleppo governorate solely against ISIL.  In 2017–18, the U. S. intentionally attacked the Syrian government 10 times, while in Sep. 2016 it accidentally hit a Syrian base, killing over 100 SAA soldiers. Syria maintains that this was an intentional attack. d HTS's predecessor (the al-Nusra Front) and ISIL's predecessor (ISI) were allied al-Qaeda branches until April 2013. An ISI-proposed merger of the two into ISIL was rejected by the Al-Nusra Front and al-Qaeda cut all affiliation with ISIL in February 2014. e Syrian Liberation Front and Tahrir al-Sham's predecessor, al-Nusra Front, were allied under the Army of Conquest from March 2015 to January 2017, while later the SLF joined the National Front for Liberation. f Number includes Kurdish and ISIL fighters, whose deaths are also listed in their separate columns.