sentences:  Three Iranian regular divisions, the Revolutionary Guard, and Kurdistan Democratic Party (KDP) elements amassed in Marivan and Sardasht in a move to threaten the major Iraqi city Suleimaniyah.Iran's strategy was to press Kurdish tribes to occupy the Banjuin Valley, which was within 45 km (28 mi) of Suleimaniyah and 140 km (87 mi) from the oilfields of Kirkuk.To stem the tide, Iraq deployed Mi-8 attack helicopters equipped with chemical weapons and executed 120 sorties against the Iranian force, which stopped them 15 km (9.3 mi) into Iraqi territory.