"The Americans added several new gasses to the chemical arsenal but they never invented anything that caused more discomfort than 'skunk gas'. That was not the scientific name, but the one given it by the men of the First Gas Regiment, who used it. The First Gas Regiment was the only American chemical warfare unit that reached France. Its activities are little known, even to the front-line troops with whom its elements fought, for in those days new tricks in gas were among the 'hush-hush' features of the war... 'Skunk gas' never killed anybody, since it was not lethal, nor was it intended to be. It was, however the most unpleasant dose ever dished out by one army for another. Fritz hated it. When it fell in his territory [he left]..."
More articles on W.W. I chemical warfare can be found here...
