Operation Dawn-4

Operation Dawn 4 was an Iranian operation of the Iran–Iraq War launched in October 1983. At the end of the operation Iran had captured a small amount of territory from the Iraqis.

Units of Iraq's 1st Corps spent two months in their trenches waiting for the Iranians to attack. The offensive began on the 19 October 1983 and the Iranians and Peshmerga guerrillas of the Patriotic Union of Kurdistan conquered about 250 sqmi of territory. This included exerted a significant amount of pressure on Penjwen.

Saddam Hussein responded with a counterattack, using the Iraqi Republican Guard and poison gas. However, they failed to dislodge the Iranians, who were dug-in and reinforced by Kurdish fighters.

The battle
The focus of the fourth Dawn operation in October 1983 was the northern sector in Iranian Kurdistan. Three Iranian regular divisions, the Revolutionary Guard, and Kurdistan Democratic Party (KDP) elements amassed in Marivan and Sardasht in a move to threaten the major Iraqi city Suleimaniyah. Iran's strategy was to press Kurdish tribes to occupy the Banjuin Valley, which was within 45 km (28 mi) of Suleimaniyah and 140 km (87 mi) from the oilfields of Kirkuk. To stem the tide, Iraq deployed Mi-8 helicopters equipped with chemical weapons and executed 120 sorties against the Iranian force, which stopped them 15 km (9.3 mi) into Iraqi territory. 5,000 Iranians and 18,000 Iraqis were killed and wounded.

Iran regained 110 km2 (42 sq mi) of its territory in the north, captured 15 km2 (5.8 sq mi) of Iraqi land, and 785 Iraqi prisoners while Iraq abandoned large quantities of valuable weapons and war materiel in the field. Iraq responded to these losses by firing a series of SCUD-B missiles into the cities of Dezful, Masjid Suleiman, and Behbehan, while the Iraqi naval aircraft mined the port of Bandar Khomeini. Iran's use of artillery against Basra while the battles in the north raged created multiple fronts, which effectively confused and wore down Iraq.

Aftermath
The attack was successful but the Iranians suffered high casualties due to Iraqi gas attacks. Unlike other operations and battles of the Iran–Iraq War, environmental conditions and operative restrictions were of high significance for this operation. Also the military medicine organization of the Pasdaran was important in this battle; they used special methods to save the wounded and carried out rescue operations.

However, in response to this victory, the Iraqis launched the first Scud missiles into Iran, hitting six cities.

Iran
Islamic Revolutionary Guard Corps:
 * Hamzeh Sayyed-osh-Shohada Headquarters
 * 31st Ashura Division
 * Commanded by Mehdi Bakeri
 * 44th Qamar-e Bani-Hashem Brigade
 * 41st Tharallah Division
 * Commanded by Qassem Soleimani
 * 17th Ali ibn Abi Taleb Division
 * Commanded by Mehdi Zeinoddin
 * 25th Karbala Division
 * Commanded by Morteza Ghorbani
 * 14th Imam Hossein Division
 * Commanded by Hossein Kharrazi
 * 8th Najaf Ashraf Division
 * Commanded by Ahmad Kazemi

Islamic Republic of Iran Army Ground Forces
 * 28th Infantry Division of Kordestan
 * 21st Hamzeh Division of Azarbaijan

Iraq

 * Iraqi Army
 * Republican Guard
 * Iraqi Army Air Corps
 * Iraqi Air Force