World War 1
Worldwar1.com: Trenches on the Web: Armory: Gas Warfare
Detailed information on the use of chemicals as weapons during WWI. Includes images of soldiers wearing gas masks, an extensive list of chemicals and their effects, and links to further information on the Second Battle of Ypres and to...
US Holocaust Memorial Museum
U.s. Holocaust Memorial Museum: Gassing Operations
A description of the Nazi use of poison gas to eliminate "undesirable" persons, whether because of their physical or mental health, or because of their religious or ethnic dispositions.
First World War
First World war.com: Weapons of War, Poison Gas
FirstWorldWar.com offers a section titled "Weapons of War," that includes information on the development and use of poison gas.
Brigham Young University
Brigham Young University: World War I Document Archive: The Use of Poison Gas
Two stories by reporter Will Irwin, correspondent from the New York Tribune, about how poisonous gases were used by the Germans during World War I.
Wikimedia
Wikipedia: World War I
This site from the Encyclopedia Wikipedia provides an in-depth encyclopedia article on World War I, giving information about the origins of the war, the initial outbreak, new technology introduced during the war, the Russian Revolution,...
Ibis Communications
Eye Witness to History: Gas Attack, 1916
This article provides a description of what a poison gas attack was like.
First World War
First World War: Weapons of War
Part of a larger site on WWI, Weapons of War gives a detailed review of weapon technology. Thorough information is provided on bayonets, flamethrowers, grenades, machine guns, pistols, poison gas, rifles, tanks, and trench mortars.
The History Cat
The History Cat: Stalemate on the Western Front
Summarizes the military efforts of the British and the Germans to defeat the enemy early in the war, which resulted in lengthy trench warfare along the Western Front. This led to the use of poisonous gases by each side, with deadly...
Other
Auschwitz Alphabet: Zyklon B (Poison Gas)
This page describes how the Nazis used Zyklon B as a gassing agent.