When Germany unleashed chlorine gas at Ypres in 1915, it marked the dawn of modern chemical warfare. Soldiers had no masks, no protection—only panic and death. Was this the most inhumane weapon of WWI ...

The first world war saw the first widespread combat use of modern chemical weapons ... an important reminder of the stupidity of war “Gas masks and their grotesque appearance became the ultimate ...

A sign hanging above the doors to the gas chamber reads, "Even the brave cry here." A dozen at a time, Marines are ushered into a small, dark, brick room. A thick haze of o-Chlorobenzylidene ...