The war between Iran and Iraq started in 1980 when Saddam Hussein sought to take advantage of Iran’s chaos by conquering and annexing Iran’s oil-rich Khuzestan province, and in the larger sense, destroying the Iranian islamic regime’s military. In turn, the Iranians sought to first repulse the Iraqi attack and then knock Hussein out of power and replace him with an Iraqi theocratic government modeled on Iran’s.
The war ended up lasting eight years and was one of the worst of the 20th century. For the most part, Iran employed high-tech systems like the MIM-23 Hawk SAM and AH-1 Cobra attack helicopter, but there were some WWII weapons in Iran’s use as well.
(Iranian WWII-vintage M4 Sherman and M36 Jackson on the front lines of the 1980-1988 war.)
(Iranian WWII-era M115 artillery during the 1980-1988 war against Iraq.)