Iran–Iraq War
Iraq mobilized many aircraft to carry out air strikes on 15 cities and air bases in Iran, including the capital Tehran. Beginning in March 1982, Iranian forces shifted to the counter-offensive. On 29 June 1982, Iraq announced that it had withdrawn its forces from the occupied Iranian territory and the border between the two countries was restored to its pre-war status. Iranian defenses are focused on the northern front to block the main routes and delay the Iraqi army's advance. Iran blocked the momentum of the Iraqi offensive and gradually seized the initiative in the war. In September 1981, Iran launched a major counteroffensive. At the end of September, the Iraqi siege of Abadan was lifted with the launch of a major Abadan counter-offensive. On April 20, Iran again concentrated the forces of nearly three divisions, and a large number of revolutionary Guards, about 100,000, launched the "Jerusalem Al-Quds Operation" offensive to recover the city of Khorramshahr. After 25 days of fierce fighting, the city of Khorramshahr, an important port city in the south, was finally recaptured. On 10 June, Iraq proposed and unilaterally implemented a cease-fire, announced that it recognized the continued validity of the Algiers Agreement signed by the two countries in 1975, and was ready to negotiate with Iran based on the recognition of Iraq's fundamental rights.