I cannot vouch for the site, although it looks interesting. The article is very specific in its claims:
The Gulf War Story No One Would Publish
--snip
The meeting followed a story I had written on Gulf War Illness, when I had cautiously been told about a top secret US mission known as "Black Cat." This, I was told, involved a "black" US B52 bomber launching from Offut AFB in Nebraksa, and flying a round-trip to the Persian Gulf.
The hulking bomber carried one bomb packed with VX nerve agent, the most potent chemical weapon in the US CW armoury. The bomb was dropped on elements of the Republican Guard in Southern Iraq, I was informed. Heavy casualties apparently resulted. The operation, directed by the Central Intelligence Agency, was a counter-strike, following an Iraqi Scud that fell on Israel. The missile had contained Sarin and drove the Israeli government almost apoplectic with rage. Fuming, the Israeli's had readied to detonate a nuclear warhead high above Baghdad. Only the swift intervention of President George Bush forestalled what would have been a cataclysmic move destined to unravel the carefully wrought Arab backed Coalition lined-up against Iraqi dictator Saddam Hussein.
--snip
http://www.deepblacklies.co.uk/operation_black_dog.htm