The specter of poison gas, a weapon designed to inflict maximum suffering, did not end with the fall of Saddam Hussein’s regime. It haunted the region for decades, shaped the geopolitical landscape, and ultimately served as the central, and tragically flawed, justification for a war that would redefine the 21st century. The story of chemical weapons in Iraq is not a single event but a multi-layered tragedy, beginning with a brutal eight-year conflict and culminating in an invasion based on intelligence that would later be proven catastrophically wrong.

The origins of this horror can be traced to the dusty battlefields of the Iran-Iraq War, a conflict that began on September 22, 1980, when Saddam Hussein, newly solidified in power, launched an invasion of Iran. Believing the post-revolutionary Iranian military to be in disarray, Hussein sought to seize control of the strategic Shatt al-Arab waterway and other disputed border territories. The initial Iraqi advance was swift, but the war quickly bogged down into a brutal stalemate.

By 1982, Iran had regrouped, launching wave after wave of human-wave assaults that pushed Iraqi forces back across the border and threatened key cities like Basra. Facing the real possibility of a catastrophic defeat, Saddam Hussein made a calculated and monstrous decision: he would deploy chemical weapons.

Iraq was a signatory to the 1925 Geneva Protocol, which explicitly banned the use of chemical and biological weapons. On paper, it was committed to this international norm. Behind the scenes, however, Iraq had been secretly developing a formidable chemical arsenal since the 1970s.

The heart of this program was the Al Muthanna State Establishment near Samarra, a sprawling facility where scientists produced mustard gas and nerve agents like tabun. Much of the equipment and precursor chemicals were sourced from foreign suppliers in Europe and elsewhere, often disguised as civilian industrial materials. This clandestine program was now about to be unleashed on the battlefield.

Beginning in 1983, as Iranian pressure mounted, Iraqi commanders authorized chemical strikes. The first agent used extensively was mustard gas, a horrifyingly insidious weapon. Unlike fast-acting nerve agents, mustard gas is a blistering agent that burns the skin, eyes, and lungs.

The effects are delayed, often taking hours to manifest. Victims initially feel nothing, but soon their skin erupts in agonizing blisters, their eyes swell shut, and their lungs begin to fill with fluid as tissue damage spreads. Death, when it comes, is a slow, agonizing process of respiratory failure or secondary infection.

Iranian troops, often lacking adequate protective gear, began suffering casualties that defied conventional explanation. By March 1984, the evidence was undeniable. A United Nations investigation team visited Iran, examined the victims, and confirmed that mustard gas had been used.

They also found traces of tabun, a nerve agent that attacks the nervous system, causing seizures, paralysis, and rapid death.

The world was officially informed of this flagrant violation of international law, yet no major military intervention was launched to punish Iraq. The geopolitical calculus of the Cold War era was complex. Many global powers, particularly the United States, viewed the post-revolutionary Islamic Republic of Iran as a more significant strategic threat.

Iraq, despite its use of chemical weapons, was seen as a bulwark against Iranian expansionism. Consequently, Iraq continued to receive political, economic, and military support from various countries, even as its chemical attacks intensified. The international community’s failure to enforce its own prohibitions sent a clear message to Baghdad: the use of these horrific weapons would carry no meaningful consequence.

By 1987, the war had ground on for seven years, and a second, internal conflict was escalating in the north. Kurdish groups, long seeking autonomy from Baghdad, had been cooperating with Iran against Saddam’s government. To the Iraqi dictator, this was an act of treason during wartime.

In March 1987, he appointed his cousin, Ali Hassan al-Majid, to oversee the northern bureau of the Ba’ath Party, granting him sweeping authority to arrest, deport, and execute without any judicial oversight. The campaign that followed was codenamed Anfal, an Arabic word meaning “the spoils.” It was a systematic campaign of genocide against the Kurdish population, encompassing mass executions, the destruction of thousands of villages, and the widespread use of chemical weapons.

From February to September 1988, Iraqi forces launched eight distinct military phases under the Anfal campaign. Army units, Republican Guard divisions, and intelligence officers moved from village to village, rounding up entire communities. Men and teenage boys were separated from women and children at checkpoints, loaded onto trucks, and driven to remote desert locations where they were executed and buried in mass graves.

Women, children, and the elderly were sent to detention camps, where they faced starvation, disease, and brutal conditions. Chemical weapons were a key tool in this campaign of terror. The most infamous attack occurred on March 16, 1988, in the town of Halabja, near the Iranian border.

Iraqi aircraft dropped a mix of chemical bombs, including mustard gas and nerve agents like sarin, on the town of roughly 50,000 people. Witnesses described clouds of different colors drifting through the streets, and a sweet, apple-like smell before their eyes began to burn and their breathing became constricted. Around 5,000 civilians died within hours or days, and up to 10,000 more were injured, many suffering from chronic lung disease, cancers, and birth defects for the rest of their lives.

Halabja became the symbol of Saddam’s chemical brutality, but it was not an isolated incident. Chemical weapons were used in at least 40 Kurdish villages during the Anfal campaign. By the end of 1988, approximately 4,000 villages had been destroyed, and the total number of Kurds killed is widely estimated at around 182,000.

The international reaction was one of condemnation, but again, there was no direct military action. The Iran-Iraq War ended in August 1988 with a UN-brokered ceasefire, leaving Saddam Hussein in power with his chemical arsenal, though depleted, still intact. He had survived both a brutal war and international criticism, and his regime began to rebuild its conventional forces while maintaining its chemical capabilities.

The next chapter in this saga began on August 2, 1990, when Saddam Hussein ordered the invasion of Kuwait. Within two days, Kuwait City had fallen, and Saddam declared Kuwait Iraq’s 19th province. This act of aggression shocked the world and brought the fear of chemical weapons back into sharp focus.

The United Nations swiftly condemned the invasion and imposed economic sanctions. The United States, under President George H. W.

Bush, built a massive international coalition of 35 countries to liberate Kuwait. As coalition troops deployed to the Gulf region, they trained relentlessly for chemical warfare scenarios. Soldiers practiced donning their protective masks in under nine seconds and were issued heavy, uncomfortable chemical protective suits known as MOPP gear, which were standard issue in the desert heat.

Commanders genuinely believed the risk of a chemical attack was real and imminent.

The air campaign, Operation Desert Storm, began on January 17, 1991, targeting Iraqi air defenses, command centers, and suspected weapons storage sites. The ground war followed in late February and lasted only 100 hours before Kuwait was liberated. Throughout this period, coalition planners expected Saddam to use chemical weapons as a last resort, especially as his forces faced defeat.

He did not. Historians believe that strong warnings from the United States, including hints of overwhelming retaliation, discouraged him from crossing that line. Others argue that the heavy damage inflicted on Iraqi command and control systems by air strikes made coordinated chemical attacks difficult.

Even without chemical shells falling on coalition forces, the weapons still left a mark on the conflict in a different, more insidious way.

After the ground campaign ended, coalition troops began destroying captured Iraqi military equipment and ammunition depots. In early March 1991, US Army engineers conducted demolitions at a site near Khamisiyah in southern Iraq. Unbeknownst to them, some of the captured rockets contained sarin and cyclosarin nerve agents.

When the bunkers were blown up, these agents were released into the air. The amounts were likely low and dispersed by the wind, but exposure still occurred. Many veterans of the 1991 Gulf War later reported a range of chronic health problems, including headaches, memory loss, chronic fatigue, muscle and joint pain, and sleep disorders.

These symptoms became known as Gulf War illness, and while the exact cause remains debated, chemical exposure is considered by many researchers to be a major contributing factor.

The end of the Gulf War came with strict conditions for Iraq. Under UN Security Council Resolution 687, Iraq was ordered to declare and eliminate all weapons of mass destruction, including chemical, biological, and nuclear weapons, along with the missiles to deliver them. The UN created the United Nations Special Commission (UNSCOM) to enforce this.

Inspectors arrived in Iraq in mid-1991 and discovered one of the largest chemical weapons programs in the world. The regime admitted to producing over 3,800 tons of mustard gas, 210 tons of sarin, and around 2. 5 tons of VX nerve agent, a substance far more deadly than sarin.

They also acknowledged filling more than 100,000 munitions with chemical agents. Over the next few years, UNSCOM oversaw the destruction of thousands of rockets and shells and dismantled facilities tied to chemical and biological programs. But cooperation from Baghdad was never smooth.

Iraqi officials delayed access, stopped convoys, and provided incomplete or contradictory paperwork. Inspectors often arrived at a suspected facility only to find it recently cleaned out.

The standoff grew increasingly tense throughout the 1990s. In 1997, Iraq accused some UNSCOM inspectors of spying for the United States and expelled American members of the inspection teams. By 1998, the situation had reached a breaking point.

Iraq announced it would stop cooperating fully with UNSCOM and barred access to several presidential sites. In December 1998, the United States and the United Kingdom launched Operation Desert Fox, a four-day campaign of air strikes and cruise missile attacks targeting suspected weapons facilities, air defenses, and command centers. When the bombing ended, UNSCOM inspectors withdrew from Iraq and did not return.

This created a four-year gap with no international weapons inspectors inside Iraq, a period that would prove to be a catastrophic intelligence vacuum.

In this information void, suspicion replaced clear evidence. Iraq claimed it had destroyed its chemical weapon stockpiles in the early 1990s, but without inspectors on the ground, no one could fully verify this claim. Some intelligence agencies believed Saddam was hiding something.

Then, on September 11, 2001, the global atmosphere changed overnight. After the attacks, President George W. Bush and senior officials began talking about the danger of weapons of mass destruction falling into the hands of hostile regimes or terrorist groups.

Iraq quickly returned to the center of attention. Even though Iraq was not directly responsible for the 9/11 attacks, US intelligence agencies argued that Saddam Hussein still possessed weapons of mass destruction, including chemical weapons. There were claims of hidden stockpiles, mobile laboratories capable of producing chemical or biological agents on trucks, and a potential to restart large-scale production if sanctions were lifted.

In his January 2002 State of the Union address, President Bush referred to Iraq as part of an “axis of evil.” The fear was not just about what Saddam had done in the 1980s, but about what he might do in the future. In November 2002, the UN Security Council passed Resolution 1441, giving Iraq a “final opportunity” to comply with its disarmament obligations.

A new inspection body, UNMOVIC, led by Swedish diplomat Hans Blix, was formed, and inspectors returned to Iraq in late 2002. They visited dozens of sites and reported that Iraq’s cooperation was improving in some areas but still incomplete in documentation. The picture was murky, with unanswered questions about missing quantities of chemical agents from the 1980s, but there was no clear proof of ongoing large-scale production.

The US government argued that Iraq was still hiding weapons.

In February 2003, Secretary of State Colin Powell presented intelligence to the UN Security Council, showing satellite images, diagrams, and describing intercepted communications and alleged mobile chemical labs. He warned that Saddam Hussein retained the capability to produce and use chemical weapons. Many countries remained skeptical, and debates at the UN grew heated.

Some governments wanted more time for inspections, while others believed Iraq had already violated too many resolutions. On March 20, 2003, the United States and coalition forces launched Operation Iraqi Freedom, an invasion of Iraq. Air strikes hit Baghdad, and ground forces crossed from Kuwait into southern Iraq.

Within three weeks, Iraqi defenses collapsed. On April 9, 2003, US forces entered central Baghdad, and images of Saddam Hussein’s statue being pulled down in Firdos Square spread across the world. The regime that had ruled Iraq since 1979 was gone in weeks.

Coalition forces began securing suspected weapon sites almost immediately, but the expected stockpiles were not found. The US military and CIA formed the Iraq Survey Group, a task force of around 1,400 experts, to search for weapons and interview former Iraqi officials. They did discover old, degraded chemical munitions dating back to the Iran-Iraq War, but they did not find active stockpiles of chemical weapons ready for use in 2003.

In October 2004, the Iraq Survey Group released its final report, known as the Duelfer report. It concluded that Iraq had ended its chemical weapons program in the 1990s after the Gulf War. Saddam Hussein had maintained the knowledge and some dual-use equipment that could potentially restart production if sanctions were lifted, and he intended to preserve the option to rebuild.

But at the time of the 2003 invasion, Iraq did not possess deployable chemical weapons.

This conclusion hit hard. One of the central claims used to justify the war had collapsed. Politically, this caused major fallout in the United States and the United Kingdom.

Intelligence agencies were criticized, and questions were raised about how pre-war assessments had been made. Trust in official claims took a serious hit. The horror of chemical weapons in Iraq was never just about the chemicals themselves.

It was about how easily they could be used when power, fear, and desperation collided. It was about the calculated decision of a dictator to use them against his own people and his enemies. And it was about the global community’s failure to stop him, leading to a war fought on a false premise.

Once the knowledge exists and the materials are scattered, they do not simply disappear with a regime. The legacy of those weapons, the suffering they caused, and the lies they inspired continue to shape the Middle East and the world to this day.