| Conflict: | Operation Beit ol-Moqaddas |
| Partof: | Iran–Iraq War |
| Date: | 24 April – 24 May 1982 |
| Place: | Khuzestan, South-West Iran |
| Territory: | Iranians liberated Khorramshahr and the town of Hoveyzeh as well as villages, around 4,500 km2 overall, and pushed Iraqi forces to near the border |
| Result: | Iranian victory |
| Commander1: |  Col. Ahmad Zeidan (Commander of Iraqi forces in Khorramshahr) Maj. Gen. Salah al-Qadhi (commander of III Corps) |
| Commander2: | Mohsen Rezai Col. Ali Sayad Shirazi Gholam Ali Rashid Col. Massoud Monfared Niyaki Hassan Baqer Col. Hossein Hassani Saadi Ahmad Gholampoor Col. Siroos Lotfi |
| Strength1: | 65,000 troops:[1] 90 infantry battalions 43 armored battalions 23 mechanized battalions 22 commando battalions 12 border guard battalions 30 artillery battalions 500 tanks, 500 APCs and 500 artillery pieces |
| Strength2: | 200,000 troops: 112 infantry battalions 23 armored battalions 9 mechanized battalions 29 artillery battalions 5 combat engineer battalions 1 pontoon bridge battalion 4 army aviation units (96 helicopters) 700–1,000 tanks[2] ≈600 artillery pieces |
| Casualties1: | 8,000 killed 15,000 wounded 19,000 captured----250 tanks, 300 APCs, 100 artillery pieces destroyed or captured |
| Casualties2: | 12,000–15,000 killed 25,000 wounded----400 tanks destroyed |
Operation Beit-ol-Moqaddas (Persian: عملیات بیتالمقدس; Operation Jerusalem), also known as the Operation Toward Beit-ol-Moqaddas (Persian: عملیات الی بیتالمقدس),[3] was an Iranian operation conducted during the Iran–Iraq War. The operation was a success, as it achieved its standing aim of liberating Khorramshahr and pushed Iraqi troops back to the border. This operation, coupled with Operation Tariq-ol-Qods, and Operation Fath-ol-Mobin, succeeded in evicting Iraqi troops from southern Iran and gave Iran the momentum.
See also: Battle of Khorramshahr (1980). On 22 September 1980, because of his desire that Iraq should have complete dominance over the Shatt al-Arab (or the Arvand Rūd) waterway, Iraqi President Saddam Hussein declared war against Iran and launched a land invasion of southern Iran, although operations did occur elsewhere on the Iran–Iraq border. After achieving successes due to the post-Revolution military and political chaos in Iran, Saddam Hussein ordered that the Iraqi troops "dig-in" on the front line. He hoped that this would show the world that he cared about the fate of the Iranian people, and that he was only concerned with achieving his aim of securing the entire Shatt al-Arab waterway, which had been under dispute since the 1975 Algiers Agreement. However, since the Islamic Revolution of Iran in 1979, Iraq had felt that it was necessary to assume what it wanted through force, since previous attempts in getting the revolutionary Iranian government to negotiate a new settlement had proved fruitless.
Once the Iraqi forces had settled, the Iranians were planning a series of operations designed to evict the Iraqis from southern Iran, of which Operation Tariq al-Qods was one.
The Iranians attacked, with some 70,000 soldiers in the Ahvaz–Susangerd area. The Iraqi forces in the area withdrew, and strengthened the defenses of Khorramshahr.
The Iraqis launched a counter-offensive on 20 May. However, despite its scale, the Iranians were able to repulse the attack.
On 24 May, the Iranians liberated Khorramshahr; the strategic and symbolic Iranian city whose capture by Iraq had been the low-point of Iranian fortunes in the early days of the war.[4]
The Iraqis were ordered to retreat, although many had done so when Khorramshahr had fallen, back into Iraq. The Iranians captured 15,000-19,000 Iraqi troops and a substantial amount of Iraqi military hardware in Khorramshahr.
The commander of the Iraqi forces in the city, Colonel Ahmad Zeidan, attempted to flee, but was trapped in a minefield which previously had been set up on his orders, and killed when he stepped on a mine.[5]
Iranian units involved in the operation were as follows:[6] [7] [8] Each IRGC battalion was consisted of 300 Basij volunteers at most, while each Army battalion was around 2.5 times bigger. However, the number of battalions in each IRGC brigade was bigger than those of the Army.[9]
Karbala Central Headquarters
Commanded by Mohsen Rezaei (IRGC commander) and Col. Ali Sayyad Shirazi (Army commander)
Combat engineer units involved were as follows:
100 engineering vehicles overall
Other forces included:
The IRIAF conducted 2,161 sorties overall. Air support duties were performed using 2 surface-to-surface missile bases together with F-4 Phantom II and F-14 Tomcat fighter jets. 20 sorties were conducted in the first day and 6 sorties in other days as close air support. 3 airbases were dedicated to medical evacuation duties, with 12-20 sorties per day.
Iraqi units involved in the operation were as follows:[10]