Operation Valfajr-4 ( Dawn 4) was an Iranian operation of the Iran-Iraq War launched in 1983. At the end of the operation Iran had captured a small amount of territory from the Iraqis. Units of Iraq's First Army Corps spent two months in their trenches waiting for the Iranians to attack. The offensive came on 19 October 1983 as the Iranians and guerillas of the Patriotic Union of Kurdistan took of territory. This included a number of Kurdish villages and exerted a significant amount of pressure on Penjwin.