Operation Fath-ol-Mobin (Persian: عملیات فتح‌المبین, a Quranic phrase meaning "Undeniable Victory" or "Manifest Victory") was a major Iranian military operation conducted during the Iran–Iraq War, in March 1982. The operation was led by Lt. General Ali Sayad Shirazi, and was conducted in four phases.

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Operation Fath ol-Mobin
Part of Iran–Iraq War
Operation Fath ol-Mobin, Map
Date 22–28 March 1982 (6 days) Location Khuzestan, South-West Iran Result Iranian victory Territorial changes Iranians recapture the Dezful–Shush area Iraqi siege on Shush is broken
Belligerents
Iraq	Iran
Commanders and leaders
Saddam Hussein	Ali Sayad Shirazi Hossein Kharrazi Mohammad Boroujerdi Massoud Monfared Niyaki Masoud Golshani
Strength
80,000–160,000 soldiers	80,000–100,000 regulars 40,000 Pasdaran 30,000 Basij 15,000 militia
Casualties and losses
8,000 killed 10,000-20,000 captured[1] 361 tanks, IFVs & APCs, 18 aircraft, 300 vehicles, 50 artillery pieces & 30 engineering vehicles destroyed 150 tanks, 170 APCs, 500 vehicles, several SA-6 missiles, several surface-to-surface missiles, 165 artillery pieces (182 mm, 130 mm, 152 mm) & 50 engineering vehicles captured[2]	4,000 killed 12,000 wounded[1] 196 tanks and ≈200 APC's destroyed[1]

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Some believe that this operation was the turning point in the war^[3][4] and that it led to the eviction of Iraqi troops from Khuzestan. Others (including Efraim Karsh) believe it was actually the operation working in tandem with others which led to the expulsion of Iraqi troops from southern Iran. He believes that in fact, Operation Beit ol-Moqaddas, which lasted from April to May 1982, had the greatest effect, because the Iranians were able to liberate the strategically important city of Khorramshahr.

On 22 September 1980, Saddam Hussein, attempting to copy the success of the Israeli pre-emptive air strike against the Arab air forces in the Six-Day War, launched numerous sorties against Iranian air fields, hoping to destroy the Iranian air force on the ground. Although they failed, Saddam was still not going to be prevented from achieving his aim of establishing complete Iraqi dominance over the Shatt al-Arab, called Arvand Rood in Iran (Persian: اروند رود) waterway. He launched a land invasion of Iran, focusing on southern Iran.

He was able to achieve success, capturing the major Iranian city of Khorramshahr. Although the Iraqis were not able to capture the city of Abadan, the way was open to Tehran as the Iranian defenses had collapsed. The Iraqi advance was halted at the Karun and Karkheh rivers respectively and now Iran was able to counter-attack; although their previous counter-attacks had ended in failure, this one would be successful.^{[citation needed]}

On 22 March 1982, precisely 18 months to the day of the Iraqi invasion, the Iranians launched Operation Fath ol-Mobin. They intended to use a pincer movement to encircle Iraqi forces who had halted outside the Iranian town of Shush. Under the command of the young Iranian Chief-of-Staff, Lieutenant General Ali Sayad Shirazi, the Iranians launched an armored thrust on the night of the 22nd followed by constant human-wave attacks by Pasdaran and Basij brigades, each composed of about 1,000 fighters.

The Iranians suffered much greater casualties than the Iraqis, because the Iranian attack at times involved massive unsupported frontal assaults made by the Pasdaran and Basij. The Iranian forces still had to contend with an Iraqi army which was entrenched on the front-line and they enjoyed a good amount of tank, artillery, and aerial support. The Iranians kept up the momentum against the Iraqi forces and, after heavy Iraqi losses, Saddam ordered a retreat on the 28th. Three Iraqi divisions were encircled in the operation and destroyed within a week. ^{[citation needed]}

Along with Operation Tariq al-Qods and Operation Beit ol-Moqaddas, the Iranians were able to evict the Iraqi forces from southern Iran. The wider operation to re-capture Khuzestan is rightly to be considered a turning point. The Iranians had succeeded in achieving their standing aim of reversing the gains made by the Iraqi armed forces in the initial stages of the Iran-Iraq War. Afterward, the Iranian hardliners, headed by the Speaker of the Iranian Parliament Akbar Hashemi-Rafsanjani, argued for the expansion of Iranian war operations into Iraq. They eventually succeeded in getting their way, and the Iranians commenced several operations to conquer territory.

But where the Iranians successfully used combined-arms operations to emerge victorious against the Iraqi troops in Iran, they relied upon unsupported human wave attacks by the poorly trained and lightly equipped troops of the Pasdaran and the Basij with an insufficient logistics capability.

The Iraqis eventually stabilized their armed forces after their retreat from Iran. The result was that the Iranians would not be able to press their determined, but futile, assaults against a resurgent Iraqi army. Iraq was supported by both the United States and the Soviet Union who saw Saddam's regime as a much better option than Khomeini's regime.^[5]