Alleged Chemical Attack, December 22, 2012
What would be the first confirmed chemical weapons attack of the Syrian conflict (if confirmed, and it's not the first allegation) was reported on December 22, 2012. It came in the form of a Syrian Arab Army source, and accused rebel forces of releasing a toxic, yellow gas in the Damascus suburb of Daraya on Saturday, December 22, 2012. It comes about a day before the rebel claim of government forces gassing them in Homs on December 23
The following page is a stub that will be expanded in time (soon). At the moment, we cite one source with zero research:
Iranian Press TV reported on the afternoon of Sunday the 23rd:
- Militants fighting against the Syrian government have used chemical weapons against the army in Daraya near the capital, Damascus, military sources say.
- According to a commander of the Syrian Presidential Guard, at least seven Syrian soldiers were killed on Saturday after they were attacked by a chemical weapon which produced a toxic yellow gas.
- The soldiers were reportedly killed within an hour after inhaling the gas.
How well this allegation holds up against the available evidence remains to be seen.
A December 17, 2015 report of the OPCW fact-finding mission (PDF via the Trench) includes a mention of this incident, included in a "Note Verbale 150" lodged by the Syrian government. That more formally listed ten later incidents with "injuries sustained by soldiers of the Syrian Arab Republic in a number of locations as a result of the use of chlorine by opposition groups." All of these the FFM considered. This other is just mentioned:
- 2.4 In addition, Note Verbale 150 made reference to an attack where it is alleged that toxic gases were employed against Syrian Arab Army soldiers on 22 December 2012. According to the note verbale, seven fatalities occurred as a result of exposure to a yellow gas. These fatalities happened within one hour of exposure.
There's no further mention of it in the report, but in the other cases, "those affected in the alleged incidents may have, in some instances, been exposed to some type of non-persistent, irritating substance" (like chlorine) and in one case (Daraya, Feb. 15, 2015) exposed to a "sarin-like substance." 
- Syria militants use chemical weapons against Syrian forces Press TV, Sunday Dec 23, 201202:35 PM GMT
- December 17, 2015 report of the OPCW fact-finding mission (PDF via the Trench)