"What Gassing Meant"  In the "Centennial History of Missouri, by
Walter B. Stevens (1921), Maj. Norman B. Comfort described a
German  gas attack: "The German is cunning. He knew of our last
relief and gassed us terribly. Our present sector is especially
adapted to mustard gas, named 'ypenite' because this species was
first used at Ypres, pronounced "ep" with a broad 'e'.  It is a
nasty insidious gas and the most difficult to combat."  "They
pepper our paths with these mustard shells. A white powder lies
all around the bursted shell.  The odor can easily be detected,
but at first seems harmless and smells like so much lime.  The
atmosphere becomes permeated and, so much heavier than air, it
stays in volume close to the ground."  "Our particular sector is
more or less wooded and shrubbed.  It is damp, moist country,
and when the sun shines, which is really the exception in 'Sunny
France', or has been in the eight months I have been here, a
vaporous steam rises.  One by one our eyes become red as fire. 
Men comm