Saddam Hussein expected a quick victory in Iran, but his invasion stalled within months.
In short: In 1980, Iraq launched a massive invasion of Iran, banking on the chaos of the Islamic Revolution to trigger a swift collapse. Instead, Iraqi forces encountered fierce, unexpected resistance. The campaign, intended to secure regional hegemony and annex oil-rich territory, quickly devolved into a grinding, multi-year conflict.
On 22 September 1980, Iraq launched a full-scale invasion of Iran, deploying six divisions across a 644-kilometre front. Iraqi President Saddam Hussein, a secularist and Arab nationalist, viewed the new Iranian government under Ruhollah Khomeini as an existential threat. He sought to exploit the internal turmoil following the 1979 Islamic Revolution, hoping to annex the oil-rich Khuzestan province, control the Shatt al-Arab waterway, and establish Iraq as the dominant power in the Arab world. Saddam believed that Iran’s military had disintegrated and that ethnic Arabs in Khuzestan would rise up to support his forces as a liberator.
These strategic assumptions proved disastrously incorrect. Rather than collapsing, the Iranian population rallied behind their government, and the expected Arab uprising in Khuzestan failed to materialize. Iraqi troops, described by some observers as poorly led, faced stiff resistance from the Iranian military, Revolutionary Guards, and volunteers. While Iraq managed to occupy over 25,900 square kilometres of territory, their initial aerial campaign to destroy the Iranian Air Force failed. In retaliation, Iran launched effective counter-strikes, including Operation Kaman 99, which targeted Iraqi infrastructure, and Operation Morvarid, which decimated the Iraqi navy in November 1980.
By December 1980, the Iraqi offensive had lost its momentum. Iranian forces successfully defended key cities, and the Iraqi military, having depleted its strategic reserves, was forced to transition to a defensive posture. The brutal battle for the city of Khorramshahr, which left 7,000 dead on each side, exemplified the intensity of the struggle. Ultimately, the invasion failed to achieve its primary political objectives, and the conflict settled into a long, bloody war of attrition that would last for years, far exceeding the short, decisive campaign Saddam had envisioned.
The invasion was deeply rooted in long-standing border disputes, particularly regarding the 1975 Algiers Agreement, which both nations declared void shortly before the fighting began. Saddam’s administration had invested heavily in Soviet and French weaponry, yet this material advantage could not compensate for the failure to anticipate the resilience of the Iranian state. By the end of 1980, the initial Iraqi ambition of replacing Egypt as the leader of the Arab world had been replaced by the reality of a stalled, costly war.
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- Summary by Intellect · source: Iraqi invasion of Iran
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