The Iran–Iraq War (1980–1988) was one of the longest and most destructive conflicts of the late twentieth century. This article examines the causes of the war, the key battles that shaped its course, and the lasting impact it left on Iran, Iraq, and the wider Middle East.
The Iran–Iraq War stands as one of the most destructive and prolonged conflicts of the late twentieth century. Beginning in September 1980 and lasting until August 1988, the war consumed nearly an entire decade and reshaped the political and social landscape of the Middle East. For eight years the two neighboring states fought across deserts, cities, marshlands, and mountainous borders, turning large regions into battlefields. By the time the guns finally fell silent, hundreds of thousands of soldiers and civilians had lost their lives, and both societies were left economically drained and psychologically scarred. Although the war started with a sudden invasion, the problems between Iran and Iraq had been building for many years. Disputes over land, political rivalry, regional competition, and the major changes caused by the Iranian Revolution all helped spark the conflict. What first looked like it might be a short war quickly turned into a long and exhausting struggle in which both sides kept fighting but neither could win easily.
Soldiers and armored vehicles during the Iran–Iraq War (1980–1988), one of the longest and most destructive conflicts in modern Middle Eastern history.
Iran and Iraq Before the War
Relations between Iran and Iraq had rarely been simple or peaceful. The two countries shared a long frontier and centuries of political rivalry that dated back to earlier imperial eras. By the twentieth century, one of the most sensitive disputes centered on control of the Shatt al‑Arab waterway. This strategic river channel forms where the Tigris and Euphrates rivers meet and flows into the Persian Gulf, making it crucial for international shipping and the export of oil. Both governments believed the waterway was vital to their economic security and national prestige. Negotiations over its control had repeatedly generated tension. In 1975 the Algiers Agreement attempted to settle the border dispute by establishing a new boundary along the deepest part of the river channel. For several years the agreement temporarily reduced friction between the two states, but distrust never completely disappeared. Beneath the diplomatic settlement, both sides continued to view the other as a strategic rival.
Impact of the Iranian Revolution
The political situation changed in 1979 when the Iranian Revolution overthrew the monarchy of Shah Mohammad Reza Pahlavi and replaced it with an Islamic Republic led by Ayatollah Ruhollah Khomeini. The revolution did not simply transform Iran’s domestic politics; it also altered the balance of power across the Middle East. Iran’s new leadership openly promoted a revolutionary Islamic ideology that criticized secular governments and called for greater political activism among Muslim populations. In Baghdad, Saddam Hussein and the ruling Ba'ath Party viewed these developments with deep suspicion. Iraq’s leadership feared that revolutionary ideas might inspire unrest among Iraq’s own Shia majority population, which had long lived under a government dominated by Sunni political elites. The revolutionary upheaval in Iran also weakened the country’s military structure. Many experienced officers were dismissed, imprisoned, or executed during the revolutionary purges that followed the fall of the Shah. Military institutions were reorganized, command structures disrupted, and equipment maintenance neglected. To observers outside the country, Iran appeared politically unstable and militarily vulnerable.
Saddam Hussein’s Strategic Calculation and the Road to Invasion
By 1980 Iraq’s leadership believed that the regional balance had shifted in their favor. Intelligence reports suggested that Iran’s armed forces were disorganized and struggling to rebuild after the revolution. Saddam Hussein concluded that a decisive military strike might allow Iraq to achieve several goals at once. First, Iraq hoped to seize territory in Iran’s oil‑rich Khuzestan province. Second, Iraqi leaders wanted to assert stronger control over the Shatt al‑Arab waterway and reverse concessions made in the Algiers Agreement. Finally, Saddam believed that a swift victory could elevate Iraq’s status as a dominant regional power while weakening the revolutionary government in Tehran. With these objectives in mind, Iraq prepared for a large‑scale offensive. The decision to invade marked the beginning of a conflict that would soon spiral far beyond the expectations of its planners.
Iraqi Invasion of Iran in September 1980
On 22 September 1980, Iraqi forces crossed the border and began a large invasion of Iran along a wide front. At the same time, Iraqi aircraft launched surprise attacks on several Iranian air bases, hoping to destroy Iran’s air force before it could react. The strikes damaged runways and military facilities, but most Iranian aircraft survived because many were protected in reinforced shelters. Within a short time, Iranian pilots were already preparing counterattacks. Meanwhile, Iraqi ground troops moved toward key cities in Iran’s Khuzestan province. Tanks and armored vehicles advanced quickly because Iraqi leaders believed Iran would not be able to resist for long. Some Iraqi planners even expected Arab communities in the region to rise against the Iranian government and support the invasion. Instead of a quick victory, the invasion soon turned into a long and difficult battle.
Iraqi armored divisions crossed into Iran on 22 September 1980, beginning the eight-year Iran–Iraq War.
Battle of Khorramshahr and the Collapse of Iraqi Expectations
One of the first major battles of the war took place in the port city of Khorramshahr. Iraqi commanders expected to capture the city quickly, but Iranian defenders fought back strongly. Revolutionary Guard units, regular soldiers, and local volunteers defended the city and fought street by street. The battle continued for several weeks and left much of the city damaged or destroyed. Many soldiers on both sides were killed or wounded. Iraqi forces eventually captured Khorramshahr, but the long battle slowed their advance and gave Iran time to bring in more troops. This strong resistance showed that the war would not end quickly.
Heavy street fighting in Khorramshahr slowed the Iraqi advance and became one of the earliest major battles of the war.
Air War, Naval Battles, and the Expansion of the Conflict
The conflict soon expanded beyond the ground front lines. In response to the initial Iraqi air strikes, Iran launched large retaliatory raids against Iraqi air bases, oil facilities, and military installations. Iranian pilots carried out deep strikes across Iraqi territory, targeting industrial infrastructure and energy resources. At sea, the war also began to disrupt shipping routes in the Persian Gulf. Iranian naval forces attacked Iraqi oil terminals near the port of al‑Faw, damaging Iraq’s ability to export petroleum. As the conflict spread across air, land, and sea, it became increasingly clear that the war could affect international trade and energy markets far beyond the immediate battlefield.
Iran Mobilizes Volunteers for the War
After the surprise invasion, Iran slowly rebuilt its defenses. The government brought together the regular army and the Islamic Revolutionary Guard Corps and asked civilians to volunteer for the war. One important group was the Basij, a volunteer force made up of people from many parts of society. Some volunteers were teenagers who strongly believed in the revolution, while others were older citizens who wanted to defend their country. By the end of 1980, Iraqi forces were no longer advancing quickly because Iranian resistance had grown stronger.
Trench Warfare
As the front lines stopped moving, both sides began building strong defenses along the border. Trenches, bunkers, minefields, and fortified positions spread across much of the battlefield. In many ways, the fighting started to look like the trench warfare of the First World War. Instead of fast movements and quick victories, the war became a long and exhausting struggle. Both sides tried to weaken the other through repeated attacks, heavy artillery fire, and strong defensive positions.
As the war dragged on, both sides built extensive trench systems and defensive lines along the front.
Iran’s Early Counteroffensives
In 1981 Iran attempted to regain the initiative by launching counteroffensives around the cities of Dezful and Susangerd. Iranian armored units pushed forward in an effort to break through Iraqi defensive lines and drive the invaders back across the border. These early operations faced serious challenges. Coordination between different branches of the Iranian military was still developing, and some attacks advanced too quickly without adequate infantry support. During one major clash near Dezful, Iranian armored brigades moved forward rapidly but became vulnerable to Iraqi counterattacks. Iraqi tanks struck the exposed formations, destroying or disabling many Iranian vehicles. The defeat highlighted the difficulties Iran faced while rebuilding its military after the upheaval of revolution.