[2] In the Badr operation, which was carried out in March 1985 in the Hawizeh Marshes region, the Iranian forces managed to cross the Tigris river and settle on the side of the Baghdad-Basra road during a heavy battle.

Due to use of chemical weapons by the Iraqi army, this operation did not achieve the Iranian commanders' desired results.

In order to maintain defensive position, planning to implement the Ghader operation in the northwest of Iran was put on the agenda of the Iranian Armed Forces, after which logistical and procurement measures began.

This 2-month operation, during 3 stages and with the names; Ghader 1, 2 and 3 were implemented and the purpose of doing it was to dominate the city of Sidekan, Erbil Governorate and also capture the heights of this region.

[7] At 2:00 a.m. on July 15, 1985, the Iranian soldiers broke through the defense lines of the Iraqi Ground Forces and advanced from the west of the city of Oshnavieh, in the territory of Iran, to the heights of the Kalashin region, located in Erbil Governorate of Iraq.