The Iran-Iraq war also known as "The Imposed War" was a war between the armed forces of Iraq and Iran lasting from September 1980 to August 1988. This was because of Iraq invading Iran due to border disputes and conflicts between the two Islamic sects: Sunni's and Shiites.

"Although the Iran–Iraq War from 1980–1988 was a war for dominance of the Persian Gulf region, the roots of the war go back many centuries. There has been rivalry between kingdoms of Assyria (the Fertile Crescent Valley, modern Syria) and the rugged highlands to the East (Persia or modern Iran) since the beginning of recorded history in Sumer"

Iraq-Iran war

In Iran, 305,000 soldiers, 400,000 to 700,000, 900 tanks, 1,000 armored vehicles, 1,000 artillery pieces, 447 aircraft, 750 helicopters all fought in the Iran - Iraq war.