Poison gas killed 80,000 soldiers in World War I. Nearly a million more were victims who suffered its lingering effects. Initially the wind distributed chlorine gas across the battlefields of the western front but an arms race quickly developed until one in three shells contained some form of toxic gas.
It's not the statistics, however, that make this a successful documentary. A surprising amount of black-and-white footage and interviews with survivors and relatives of key players tell a compelling tale of motivations and consequences. For those who adhere to the maxim that history repeats itself, it's worth noting that despite an international convention banning chemical weapons, both sides of the Great War deployed poison gases with few reservations. As one interviewee puts it, patriotism defeated morality.