The Iran–Iraq War

The Iran–Iraq War, also known as the Imposed War (جنگ
تحمیلی, Jang-e-tahmīlī) and Holy Defense (دفاع مقدس, Defā'-e-moghaddas) in Iran, Saddām's
Qādisiyyah (قادسيّة صدّام, Qādisiyyat Ṣaddām) in Iraq, and the (First) Gulf War, was a war between the armed forces of Iraq and Iran lasting from September 1980 to August 1988. It was initially referred to in the western world as the "Persian Gulf War" prior to the "Gulf War" of 1990 with the invasion of Kuwait by Iraq.

The war began when Iraq invaded Iran, launching a simultaneous invasion by air and land into Iranian territory on 22 September 1980 following a long history of border disputes, and fears of Shia insurgency among Iraq's long-suppressed Shia majority influenced by the Iranian Revolution. Iraq was also aiming to replace Iran as the dominant Persian Gulf state. Although Iraq hoped to take advantage of revolutionary chaos in Iran and attacked without formal warning, they made only limited progress into Iran and within several months were repelled by the Iranians who regained virtually all lost territory by June, 1982. For the next six years, Iran was on the offensive. Despite calls for a ceasefire by the United Nations Security Council, hostilities continued until 20 August 1988. The last prisoners of war were exchanged in 2003.