After the attacking forces of the 5th Yugoslav People's Army (JNA) corps (Banja Luka corps) had successfully crossed Sava river into Croatia captured Okučani in western Slavonia it was their primary objective to advance along Pakrac - Grubišno Polje route and link up with th 28th partisan division on Bilogora hill, sever Podravska magistrala road route and reach Hungarian border thus completely severing Slavonia from the remainder of Croatia, including the capital, Zagreb. The Yugoslav Peoples Army (YPA) (Serbian: Југословенска народна армија / Jugoslovenska narodna armija (JHA / JNA); Croatian: Jugoslavenska narodna armija (JNA); Slovene: Jugoslovanska ljudska armada (JLA); Macedonian: Jугословенската народна армија (JНA); Albanian: Armata Popullore e Jugosllavisë) was the military force of the Socialist Federal Republic of Yugoslavia. ... Sava also Save (in Serbian: Сава; German: Save; Hungarian: Száva) is a river in Europe, a right side tributary of Danube at Belgrade. ... Okučani is a town at the contact point between the Posavina plain and the southern slopes of Psunj in western Slavonia, Croatia, 19 km southeast of Novska and 17 km west of Nova Gradiska; elevation 119 m. ... Coat of arms Slavonia is a geographical and historical region in eastern Croatia. ... Coat of arms Pakrac is a town in Slavonia, Croatia. ... Zagreb (pronounced: ) is the capital city of Croatia. ...

In order to prevent this, croatian troops have undertaken their first offensive operation of this scale during the homeland war, with the aim of securing Bilogora hills and capturing favourable positions for further advance towards Papuk mountains to the southeast thus securing land communication between Slavonia and the rest of Croatia. Papuk is the largest mountain in Slavonia, eastern Croatia. ...

Croatian troops involved included Croatian army 127th brigade (Virovitica), 57th battalion and National defense detachment (Grubišno Polje), 24th mixed artillery battalion, 52nd battalion (Daruvar), a tank platoon of 105th brigade (Bjelovar), 19th mixed antitank artillery battalion (Virovitica), special police forces from Bjelovar, and a Križevci volunteer company. Croatian Ground Army (Croatian: Hrvatska kopnena vojska), commonly referred as Croatian Army (Hrvatska vojska) is a branch of the Armed Forces of the Republic of Croatia. ... Virovitica (Hungarian: VerÅ‘ce, German: Wirowititz) is a Croatian city near the Croatian-Hungarian border. ... Daruvar is a town in central Croatia, population 9,815 (2001), total municipality population 13,243 (2001). ... The first information you can find about Bjelovar is being one of the youngest cities in Croatia, but that fact doesn’t mean less. ... Križevci is a town in central Croatia with a population of 22,324 (2001), the oldest town in its county, the Koprivnica-Križevci county. ...

The operation lasted from October 31, 1991, until November 4, 1991, Croatian troops have successfully met their objectives, and liberated 21 villages and approximately 270 square kilometers of territory.

More importantly, a strategic supply route via Virovitica - Grubišno Polje - Kutina road was reopened. Furthermore, this operation set the stage for the Operation Orkan 91 which marked yet another advance by Croatian army in this area. Kutina is a small city in central Croatia, the largest settlement in the hilly region of Moslavina, in the Sisak-Moslavina county. ...