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Operation Otkos 10
Part of the Croatian War of Independence
Date October 31 - November 4, 1991 Location western Slavonia, Croatia Result Croatian victory
Combatants
Croatian National Guard Croatian police	Yugoslav People's Army Local Serb militias
Strength
2,467 soldiers	1,750 soldiers
Casualties
5 dead, several dozen wounded	?

Croatian War of Independence
Plitvice Lakes – Borovo Selo – Vukovar (Battle, Massacre) – The Barracks – Dubrovnik – Gospić – Otkos 10 – Škabrnja – Orkan 91 – Voćin – Miljevci – Maslenica – Medak Pocket – Flash – Zagreb – Summer '95 – Storm

Operation Otkos 10 was a military offensive undertaken by the Croatian army against the Yugoslav People's Army (JNA) in Croatia. The operation lasted from October 31, 1991, until November 4, 1991 and ended with a victory for Croatia.

Contents 1 JNA offensive up to October 2 Croatian counteroffensive 3 End of the operation 4 References

After the attacking forces of the 5th JNA corps (Banja Luka corps) had successfully crossed Sava river into Croatia and captured Okučani in western Slavonia it was their primary objective to advance along Pakrac - Grubišno Polje route and link up with the 28th partisan division on Bilogora hill, sever Podravska magistrala road route and reach the Hungarian border, thus completely severing Slavonia from the remainder of Croatia, including the capital - Zagreb.

Aiding the JNA offensive was the local Serb population in west Slavonia which took up arms in early 1991.

In order to prevent JNA's attempt to cut off Slavonia, 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.

Croatian troops involved included: 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.

The operation was successfully concluded by November and Croatia captured 21 villages and approximately 270 square kilometers of its territory, twarting JNA's strategic plan to isolate Slavonia.

The area's 15,000-35,000 strong Serbian was mostly expelled and various atrocities against the civilians were reported, most notably the destruction of several thousand houses and the destruction of the historical Ecclesiastic seat at Pakrac.

More importantly, a strategic supply route via Virovitica - Grubišno Polje - Kutina road was reopened, which was the most important land route to Slavonia until Operation Flash. Furthermore, this operation set the stage for the Operation Orkan 91 which marked yet another advance by Croatian army in this area.

• Debić, I., Delić, A.: OTKOS. Matica hrvatska Grubišno Polje, Prosvjeta d.d. Bjelovar, UHBDDR Zagreb. Bjelovar, 1999.