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Even before World War I commenced, the deployment of chemical weapons was deemed a war crime, with all leading nations having committed to a treaty prohibiting their use. Yet, as hostilities erupted, these agreements were swiftly abandoned.
Chemical warfare became a grim reality of daily life on the battlefield. Soldiers crouched in trenches, vigilant for the ominous advance of gas clouds or the distinctive odors signaling the onset of a lethal chemical attack.
The desperate shouts of 'Gas! Gas!' echoing across the battlefield marked World War I as a conflict unlike any other, introducing a peril where the outcome could be more dreadful than death itself.
10. Germany Unleashed 6,000 Cylinders of Chlorine Gas Against French Troops
On April 22, 1915, near the Belgian town of Ypres, the first significant gas attack of the war unfolded. The German forces deployed 6,000 cylinders of chlorine gas, a newly developed weapon, releasing it over French troops once the wind conditions were optimal.
Ironically, the French had initiated the chemical warfare. In August 1914, they had dismissed the impact of their tear gas grenades used against German forces. Although these grenades proved largely ineffective, they ignited a chemical arms race that escalated throughout the war.
The chlorine gas attack at Ypres caught everyone off guard. Unprecedented in scale, none of the soldiers were equipped with gas masks. Within minutes, thousands perished from suffocation, while others fled in agony, their lungs burning from the toxic fumes.
A survivor described the experience as akin to drowning, but on land. He recounted a sharp, knife-like pain in his lungs, calling it a 'fiendish death.'
9. The Inventor of Chlorine Gas's Wife Took Her Own Life to Halt His Work
Fritz Haber, the chemist behind the invention of chlorine gas, was among the German soldiers deploying it. Renowned as one of history's greatest chemists, he later earned a Nobel Prize for his contributions to agriculture. However, during the war, he focused on devising increasingly lethal methods to combat Germany's foes.
Clara, his wife and a brilliant scientist herself, was horrified by her husband's actions. She condemned his work as 'a barbaric perversion of science, which should instead illuminate life,' and persistently urged him to cease his efforts.
Determined to stop him, Clara took drastic measures. Upon his return from the front for a celebration in his honor, she took his pistol, went into the garden, and ended her life with a shot to the heart, hoping her sacrifice would compel him to abandon his deadly endeavors.
Haber's resolve remained unshaken. The morning after his wife's tragic death, he departed for the Eastern Front to orchestrate yet another gas attack.
8. Canadian Troops Resorted to Urine-Soaked Cloths to Endure Gas Attacks
Just two days following the initial assault, the 1st Canadian Division faced a second wave of chlorine gas.
With limited knowledge of the Germans' new arsenal, the soldiers had gleaned some survival tactics. They learned that the gas concentrated near the ground and that fleeing exacerbated its choking effects. Staying elevated in the trenches, though risky, offered the best chance of survival.
In the absence of gas masks, medics devised a rudimentary defense. Covering their mouths with cloths provided some protection, but soaking these cloths in urine significantly enhanced their effectiveness.
As the gas descended, there was no room for hesitation or shame. Canadian soldiers ascended to the tops of their trenches, heeding their medics' advice. Many survivors later attributed their survival to this strategy. One recounted, 'I covered my nose and mouth with a handkerchief, and that act saved my life.'
However, this makeshift solution was no match for proper gas masks. The battle claimed approximately 2,000 Canadian lives, leaving behind a grim landscape of gas-ravaged bodies that would torment the survivors for years to come.
A Scottish soldier, reflecting on the aftermath, wrote, 'Upon reaching Ypres, we encountered numerous Canadian soldiers who had succumbed to the gas the previous day. It was a harrowing sight for us young men, a stark reminder of the war's brutality.'
7. British Researchers Conducted Mustard Gas Experiments on Indian Troops
After the Germans deployed chlorine gas, the rules of warfare were abandoned. The British intensified their efforts to develop chemical weapons, but not without first conducting tests—on their own troops.
By 1916, the British army had begun experimenting with chemical agents on over 20,000 of their own soldiers. Many participants later claimed they were deceived about the nature of the tests and were unaware of the dangers they faced.
Among the most harrowing experiments were those conducted in Rawalpindi, where British scientists exposed hundreds of Indian soldiers to mustard gas in sealed chambers. The objectives were clear: determine the lethal dosage of gas and observe its effects on Indian skin compared to others.
The aftermath left many subjects incapacitated for weeks, confined to hospital beds as they endured the excruciating process of having their burned flesh treated.
In their reports, the scientists coldly noted, 'Severely burned patients often experience profound misery, depression, and significant discomfort.' They added that such suffering 'must be personally endured to be fully understood.'
6. Phosgene Gas Was Responsible for Nearly 80,000 Deaths
Phosgene gas emerged as the deadliest chemical weapon of the war. Out of the 91,000 soldiers who perished from toxic gases, approximately 85% of these fatalities were caused by phosgene.
This gas was a stealthy and insidious killer. Unlike chlorine gas, it didn't induce immediate choking, allowing victims to inhale more of it. When diluted precisely, it became odorless yet remained lethal.
The first use of phosgene gas occurred on December 19, 1915, in Wieltje. The Germans released a combined 88 tons of chlorine and phosgene gas, which drifted into areas where enemy troops were resting.
Only a handful of soldiers managed to don their gas masks in time. The gas infiltrated their systems as they slept, infiltrating their lungs before they could grasp the severity of the situation.
The impact was catastrophic. The Wieltje attack resulted in 69 fatalities and 1,069 injuries. Death was not immediate; the most severe symptoms emerged after 24 hours, and the dying process could stretch over days or even weeks.
5. Mustard Gas Inflicted Unimaginable Suffering
Mustard gas was the most dreaded chemical weapon of World War I, not for its lethality but for the torment it caused. While it killed only 2–3% of those exposed, it left survivors in excruciating pain.
Exposure to mustard gas caused soldiers' skin to blister, their eyes to swell, and their vision to deteriorate. Internal and external bleeding ensued as the gas corroded their flesh. Many victims vomited repeatedly, and for those who succumbed, death was a prolonged process lasting weeks.
A British nurse lamented, 'I wish those advocating for the war at any cost could witness the agony of mustard gas victims. Their bodies are covered in large, mustard-colored blisters, their eyes blinded and glued shut, gasping for air, their voices reduced to whispers as they feel their throats closing, knowing they will suffocate.'
4. As Many as 260,000 Civilians Suffered Gas Attacks During the War
Chemical warfare didn't spare civilians. The toxic gases drifted beyond the battlefields, infiltrating towns and cities where unsuspecting civilians, including children, fell victim while they slept.
Chemical weapons caused between 100,000 and 260,000 civilian casualties during the war. While some died quickly, tens of thousands more suffered prolonged deaths from their injuries long after the war ended. Survivors endured years of agony with scarred lungs, burned skin, and severe brain damage caused by the gases.
Military leaders were fully aware of the civilian toll. British Field Marshal Douglas Haig candidly noted in his diary:
My officers and I knew that these weapons would harm women and children in nearby towns, especially given the strong winds common on the battlefield. However, since the weapons were aimed at the enemy, we were not particularly troubled by this.
3. The US Military Conducted Chemical Weapon Tests on 60,000 of Its Own Troops
Although the war concluded before lewisite could be deployed, the Americans continued testing it post-war. Over the following years, the U.S. government exposed 60,000 of its own soldiers to chemical weapons in experiments.
Black, Puerto Rican, and Japanese soldiers were disproportionately targeted in these tests. The government aimed to determine if certain racial groups exhibited heightened resistance to chemical agents. As a result, soldiers of foreign descent were systematically subjected to lewisite and mustard gas in controlled environments.
One survivor recalled, 'It felt like my body was engulfed in flames. Men screamed, shouted, and tried to escape. Some passed out. When the doors finally opened, we were in terrible condition.'
The soldiers were coerced into silence under threat of dishonorable discharge and imprisonment. This secrecy had dire consequences, as many suffered lifelong health issues but were unable to disclose the cause to their doctors.
Decades later, the truth emerged, with most survivors in their nineties. A 93-year-old man demonstrated to a reporter how his skin still shed in flakes, a lingering effect of the toxic chemicals he was exposed to over 70 years prior.
2. The US Army Disposed of Massive Quantities of Gas by Dumping It into the Ocean
After the war, the US Army opted to dispose of its stockpile of chemical weapons by discarding them into the ocean.
In total, they discarded 29 million kilograms (64 million pounds) of chemical weapons into the sea before seeking more responsible disposal methods. This practice continued until the 1970s, during which they also dumped bombs, rockets, and over 500 tons of radioactive waste into the ocean alongside the chemical weapons.
The dumping was exposed when a clam-dredging crew accidentally retrieved an artillery shell filled with mustard gas. Unaware of its contents, they opened it, releasing gas potent enough to hospitalize the workers even after decades underwater.
The waste was scattered across various locations, including both oceans and areas near Hawaii and Alaska. The US Army Chemical Materials Agency admitted, 'We do not claim to know where they all are,' acknowledging the lack of records, particularly for weapons dumped during World War I.
The United States wasn't alone in this practice. Both the British and the Russians also disposed of chemical weapons in the ocean. In the Baltic Sea, reports suggest that fish are beginning to mutate due to exposure to mustard gas.
1. The US Was Developing a Powerful Chemical Weapon
In the war's final years, the US military was secretly developing a chemical agent known as lewisite. This weapon was terrifying: even a single drop caused severe, pus-filled blisters, while larger amounts could destroy internal organs, leading victims to choke on their own damaged airways.
By 1918, over 10% of American chemists had been recruited for the government's covert chemical weapons program. Some were even compelled to test the substance on their own bodies, applying it to their skin to observe its effects firsthand.
In August 1918, residents of Washington, DC, inadvertently became test subjects when a lab explosion released lewisite into the city. The toxic gas affected nearby inhabitants, causing choking, severe burns, and even killing some animals.
The situation could have been far more catastrophic. Only 3.6 kilograms (8 pounds) of lewisite escaped during the incident. By the war's end, the US was manufacturing 10 tons of lewisite daily.
