Direct proof of use
Bellingcat's review of Syrian rebel anti-tank guided missile use identifies the 9K111 Fagot / AT-4 Spigot among the ATGM systems used during the 2011 Syrian Civil War. The article describes the Fagot as a Soviet SACLOS wire-guided anti-tank missile system and frames it within the rebel ATGM record built from archived launch footage and other visual evidence.
The clearest dated Fagot-specific point in the public record is 2016. Bellingcat reported that, during intense fighting around Aleppo, rebels received a renewed supply of Soviet-model ATGMs, mostly 9K111 Fagot / AT-4 Spigot systems, in addition to regular TOW shipments.
Sources: Bellingcat Seven Years of War
Timeline
Bellingcat counted only nine visually confirmed rebel ATGM launches in 2012, then described ATGMs as increasingly important as the war developed into a more conventional front-line conflict in 2013. It reported 257 visually confirmed rebel ATGM launches for 2013 and 468 for 2014, placing the Fagot inside a broader rebel missile environment rather than a single isolated appearance.
In December 2015, a Jane's-based Business Insider summary of U.S. shipment documents listed 9M111M missiles and Faktoria launchers among materiel sent to Syrian rebels. The same article captioned a Jaish al-Izzah still from 16 December 2015 as showing a fighter preparing to fire an ATGW that could be either a 9K111 Fagot or a 9K111M Faktoria, noting that the two were externally identical.
Sources: Bellingcat Seven Years of War, Business Insider Weapons Sent to Syrian Rebels
Battlefield role
In opposition service, the Fagot functioned as a portable anti-armor guided missile for defensive and ambush fire against Syrian government armor and other ground targets. Bellingcat describes rebel ATGMs in 2015 and 2016 as important in stopping or delaying pro-government armored assaults, particularly around Idlib, northern Hama, and Aleppo, while also noting that the overall rebel ATGM record combines several missile families.
The Fagot's role was enabled by existing Syrian stocks and by external supply streams. Bellingcat reported that the Syrian Arab Army had large pre-war stockpiles of Soviet-origin anti-tank weapons, that rebels obtained weapons from captured bases, and that sympathetic foreign states later supplied additional ATGMs. The Business Insider/Jane's shipment summary supports the transfer side of that picture for 9M111M/Faktoria materiel in late 2015.
Sources: Bellingcat Seven Years of War, Business Insider Weapons Sent to Syrian Rebels
Evidence limits
The sources used here support rebel-side Fagot/Faktoria fielding and use in the Syrian Civil War, especially in the 2015-2016 period, but they do not provide a complete public incident list for Fagot launches. Where Bellingcat discusses rebel ATGM effects by year or battle, those effects cover the broader rebel ATGM inventory rather than only the 9K111 family.
Sources: Bellingcat Seven Years of War, Business Insider Weapons Sent to Syrian Rebels