The Iran-Iraq War, also known as the Imposed War in Iran, and and Saddām's Qādisiyyah in Iraq, is a war between the armed forces of Iraq and Iran lasting from September 1980 to August 1988.

(It will be commonly referred to as the "Gulf War" or Persian Gulf War until the Iraq-Kuwait conflict of 1990–91, and for a while thereafter as the First Persian Gulf War.

The Iraq-Kuwait conflict, while originally known as the Second Persian Gulf War,will later became known simply as the Persian Gulf War.

)The war begins when Iraq invades Iran 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 Iran's Islamic revolution.

Although Iraq hopes to take advantage of revolutionary chaos in Iran and attacks without formal warning, they make only limited progress into Iran and within several months are repelled by the Iranians who regain virtually all lost territory by June 1982.

For the next six years Iran is on the offensive.

Despite several calls for a ceasefire by the United Nations Security Council, hostilities continue until August 20, 1988.

The last prisoners of war are exchanged in 2003.

The war is noted for being very similar to the First World War.

Tactics used include trench warfare, manned machine-gun posts, bayonet charges, use of barbed wire across trenches and on no-mans land, human wave attacks and Iraq's extensive use of chemical weapons (such as mustard gas) against Iranian troops and civilians as well as Iraqi Kurds.