Chemical warfare in World War I

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For more information, see: Chemical weapon.

Poison gas was the most controversial weapon of World War I-- indeed, next to nuclear weapons, among the most controversial weapons of the 20th century. Its strange history reveals much about how generals, privates, politicians and civilians understood total war.


Germany dominated the world's young chemical industry. Chlorine was an important industrial chemical; the technology to manufacture and store large quantities was well known. In 1899 the Hague Peace Conference outlawed "asphyxiating or deleterious gases." Ignoring the prohibition, German chemists, led by Nobel-prize winner Fritz Haber, promised that chlorine could break the stalemate in the trenches.

First use, 1915

The first attack came at St. Julien, during the Second Battle of Ypres on the night of 21-22 April, 1915, as Germans opened thousands of cylinders and waited for the wind to carry it into the Allied lines. Two French divisions (the 45th Algerian and 78th Territorial) fled in panic. Astonished by the results the new weapon achieved, the Germans were unprepared to take advantage and advanced slowly into the four mile gap in the line. The Canadian Division was hastily assembled and counter-attacked, restoring the front over the course of several days, at the cost of about half the division.

Gas mask or death

Within three days Allied doctors had developed a simple but adequate mask and shipped 200,000 to the front; air that was breathed through ordinary washing soda was safe. By 1916 the British soldiers carried an excellent rubber face mask with glass eyepieces and a tube connecting it to a separate respirators. The new masks gave practically 100% protection--but only when they were worn. The Russians never obtained an adequate supply, and suffered hundreds of thousands of casualties. Death came in a matter of days, due to lack of oxygen caused by pulmonary edema--the lungs filled up with fluids and the victims drowned in their own secretions. One effective treatment was therapeutic phlebotomy: surgeons cut a vein and pumped out 20- 25 ounces of blood.

Allied usage

In response, the Allies developed their own chemical weapons.

Delivery technology

Release by cylinders proved unwieldy and dangerous, for it depended on just the right atmospheric conditions; sudden wind changes could backfire for the attackers. By 1916 the belligerents turned to artillery shells, each of which could land a few pounds of liquefied poisons on targets far behind the trenches, especially enemy artillery parks and communication posts that had been spotted by airplane. On the front lines gas was a harassment but not a tactical factor. A huge amount of gas had to be released in a short period in order to be effective, yet the same amount of high explosive would do much more damage.

Phosgene and mustard gas

Chemists invented 18 new gases that were more effective than chlorine, and also masks to neutralize them. Phosgene ("Green Cross", the Germans called it) like chlorine, attacked the lungs, only more quickly--without a mask a victim had one minute to live--but it evaporated in 30 minutes.

leftWW2 US Army poster

The Germans introduced mustard gas ("Yellow Cross") in July, 1917. While not a killer, it caused severe blisters in the lungs and on exposed skin that could temporarily blind or incapacitate for weeks or months. Mustard gas (actually a liquid) evaporated very slowly, so elaborate decontamination routines were necessary to wash off humans, equipment and terrain. Late in the war, Berlin invented arsenic compounds ("Blue Cross", ) which, while not lethal, caused uncontrollable sneezing or nausea that forced victims to remove their masks, thus exposing them to lethal gases.


Three percent of all casualties on the Western Front were attributed to gas; 1,200 Americans died from it. Far larger 24 numbers were reported as casualties, but many of the cases were dubious. Both sides mixed gas shells with high explosives, and Doughboys who kept their heads down were never quite sure if they had been gassed. Only 20% of soldiers treated for mustard gas were kept in bed more than 48 hours. British statistics indicate that one in thirty-eight of the casualties from `mustard gas' died and about one in four hundred was incapacitated for six months or longer.[1] Seriously affected patients required elaborate nursing care and extended bed rest to avoid the danger of pneumonia; over 90% eventually recovered. Gas was, however, a debilitating psychological weapon. Soldiers hated the masks because of the claustrophobia, the difficulty in getting enough oxygen for strenuous movement, and the garbling of voices and commands. By 1918 the constant fear, and the continuous use of those awful masks, was a major contributor to combat fatigue--a psychological condition in which the soldier loses control of his emotions and was a liability in combat. Poison gas never won a battle. By forcing soldiers to wear their masks, it, did however, slow down the tempo of operations, made coordination difficult, ruin morale, and increase the vulnerability of soldiers to artillery and machine gun fire. Germany favored gas because it was on the defensive on the Western Front from late 1914 to early 1918, and its large, sophisticated chemical industry delivered a high quality product. Germany and Austria fired 58% of the 66 million gas shells used in the war, but with smaller steel industries, only 47% of the 1.4 billion high explosive shells. The most famous victim of gas was German corporal Adolf Hitler, hit by mustard gas in October, 1918.

"Gassed" (1919) by American artist John Singer Sargent, after visiting the front[2]

Some historians feel that the true effects of gas have been exaggerated in post-war accounts; no battle was decided by the use of poison gas, and the number of actual casualties inflicted was a tiny fraction of the overall number.[3]


  1. Oxford English Dictionary, Discovery 1934 Feb. 32/1
  2. For commentary on the paining, see Geoff Dyer on 'Gassed' at [1]
  3. Holmes, Richard Tommy: The British Soldier on the Western Front