The siege of Bjelovar Barracks, also known by the codename Operation Bilogora (), was the blockade and capture of the Yugoslav People's Army (JNA) barracks and other facilities in and around the city of Bjelovar, a part of the JNA 32nd (Varaždin) Corps, during the Croatian War of Independence. A general blockade of the JNA facilities in Croatia was ordered on 14 September 1991, and it continued until 29 September when the JNA garrison was captured by Croatian forces. Its capture occurred one week after the bulk of the 32nd Corps surrendered. It was part of the Battle of the Barracks—an effort by Croatian armed forces to isolate JNA units based at barracks in Croatia, or capture the barracks to provide arms for Croatia's nascent army.
The fighting resulted in the capture of a substantial stock of weapons, including 78 tanks, 77 infantry fighting vehicles and 13 artillery pieces greater than caliber. The clash also caused considerable damage to the city of Bjelovar and its surroundings due to artillery fire and the explosion of an ammunition storage depot on the outskirts of the city. The fighting erupted despite a ceasefire that had been arranged days before, and caused JNA General Veljko Kadijević to withdraw from negotiations regarding the ceasefire's implementation. He subsequently issued an ultimatum to Croatian authorities, warning against the capture of further JNA facilities.
Background In 1990, ethnic tensions between Serbs and Croats worsened after the electoral defeat of the government of the Socialist Republic of Croatia by the Croatian Democratic Union ( – HDZ). The Yugoslav People's Army ( – JNA) confiscated Croatia's Territorial Defence ( – TO) weapons to minimize resistance. On 17 August, the tensions escalated into an open revolt of the Croatian Serbs, centred on the predominantly Serb-populated areas of the Dalmatian hinterland around Knin (approximately north-east of Split), parts of the Lika, Kordun, Banovina and eastern Croatia. In January 1991, Serbia, supported by Montenegro and Serbia's provinces of Vojvodina and Kosovo, unsuccessfully tried to obtain the Yugoslav Presidency's approval for a JNA operation to disarm Croatian security forces. The request was denied and a bloodless skirmish between Serb insurgents and Croatian special police in March prompted the JNA itself to ask the Federal Presidency to give it wartime authority and declare a state of emergency. Even though the request was backed by Serbia and its allies, the JNA request was refused on 15 March. Serbian President Slobodan Milošević, preferring a campaign to expand Serbia rather than to preserve Yugoslavia with Croatia as a federal unit, publicly threatened to replace the JNA with a Serbian army and declared that he no longer recognized the authority of the federal Presidency. The threat caused the JNA to abandon plans to preserve Yugoslavia in favour of expansion of Serbia as the JNA came under Milošević's control. By the end of March, the conflict had escalated with the first fatalities. In early April, leaders of the Serb revolt in Croatia declared their intention to amalgamate the areas under their control with Serbia. These were viewed by the Government of Croatia as breakaway regions.
At the beginning of 1991, Croatia had no regular army. To bolster its defence, Croatia doubled its police numbers to about 20,000. The most effective part of the Croatian police force was 3,000-strong special police comprising twelve battalions organised along military lines. There were also 9,000–10,000 regionally organised reserve police in 16 battalions and 10 companies, but they lacked weapons. In response to the deteriorating situation, the Croatian government established the Croatian National Guard ( – ZNG) in May by expanding the special police battalions into four all-professional guards brigades. Under Ministry of Defence control and commanded by retired JNA General Martin Špegelj, the four guards brigades comprised approximately 8,000 troops. The reserve police, also expanded to 40,000, was attached to the ZNG and reorganised into 19 brigades and 14 independent battalions. The guards brigades were the only units of the ZNG that were fully equipped with small arms; throughout the ZNG there was a lack of heavier weapons and there was poor command and control structure above the brigade level. The shortage of heavy weapons was so severe that the ZNG resorted to using World War II weapons taken from museums and film studios. At the time, the Croatian weapon stockpile consisted of 30,000 small arms purchased abroad and 15,000 previously owned by the police. To replace the personnel lost to the guards brigades, a new 10,000-strong special police was established.
Prelude The views of the Croatian leadership on how to deal with the JNA's role in the Croatian Serb revolt gradually evolved between January and September 1991. Croatian President Franjo Tuđman's initial plan was to win European Community (EC) and United States support, so he dismissed Špegelj's advice to seize JNA barracks and storage facilities in Croatia in late 1990. During the Ten-Day War in June and July 1991, Špegelj once again urged Tuđman to act while the JNA fought Slovenia's TO. Špegelj's calls were echoed by Šime Đodan, who succeeded him as Defence Minister in July. Špegelj remained in command of the ZNG.
Tuđman's initial stance was based on his belief that Croatia could not win a war against the JNA. The ZNG was therefore limited to conducting defensive operations, even though the actions of the JNA appeared to be coordinated with Croatian Serb forces. This impression was reinforced by buffer zones established by the JNA after fighting between Croatian Serb militia and the ZNG. The JNA often intervened after the ZNG had lost territory, leaving the Croatian Serbs in control of areas they had captured before the JNA stepped in. The JNA provided some weapons to the Croatian Serbs, although most of their weaponry was sourced from Serbia's TO and the Serbian Ministry of Internal Affairs.
In July 1991, Špegelj and Đodan's advice was supported by a number of Croatian Parliament members. In response, Tuđman dismissed Đodan the same month he was appointed Defence Minister, and Špegelj resigned his command of the ZNG on 3 August. The deteriorating situation in eastern Croatia, including the JNA expulsion of ZNG troops from Baranja, intermittent fighting around Osijek, Vukovar and Vinkovci, increasing losses and the growing conviction that the JNA were actively supporting the Croatian Serb revolt, forced Tuđman to act. On 22 August, he issued an ultimatum to the federal Yugoslav authorities demanding the withdrawal of the JNA to its barracks by the end of the month. The ultimatum stated that if the JNA failed to comply, Croatia would consider it an army of occupation and take corresponding action. On 1 September, the EC proposed a ceasefire and a peace conference was accepted by the Yugoslav Presidency and by Tuđman, despite his earlier ultimatum. The conference started on 7 September, but only four days later, the Croatian member and chair of the presidency, Stjepan Mesić, ordered the JNA to return to its barracks within 48 hours. This order was motivated by Tuđman's concern that the conference would drag on while the ZNG lost territory. Even though the order was opposed by other members of the presidency, it gave Croatia justification to openly confront the JNA.
Prime Minister Franjo Gregurić advised Tuđman to implement Špegelj's plan. According to General Anton Tus, Tuđman ordered the ZNG to capture JNA barracks on 12 September, but rescinded the order the next day. The order was reinstated on 14 September after Tus pleaded with Tuđman to re-authorize action, arguing that the ZNG was running out of time. The same day, the ZNG and the Croatian police blockaded and cut utilities to all JNA facilities it had access to, beginning the Battle of the Barracks. This action comprised blockades of 33 large JNA garrisons in Croatia, and numerous smaller facilities, including border posts, and weapons and ammunition storage depots.
Order of battle Since 1988, the JNA's Bjelovar garrison had been included in the 32nd Corps, which was headquartered in Varaždin, and was the second largest JNA corps in Croatia. It commanded the 32nd Mechanised Brigade and the 32nd Mixed Artillery Regiment both based in Varaždin, the 32nd Engineer Regiment in Čakovec, the 411th Mixed Antitank Artillery Regiment based in Križevci, the 73rd Motorised Brigade headquartered in Koprivnica, the 265th Mechanised Brigade based in Bjelovar, and the 288th Mixed Antitank Artillery Brigade in Virovitica. The JNA did not have sufficient troops in the area to secure all its facilities, but it was possible that the 5th (Banja Luka) Corps units deployed to Okučani might attempt to relieve some of the garrisons. A part of the 265th Mechanised Brigade was deployed to Koprivnica to reinforce the 73rd Motorised Brigade. It consisted of a battalion of tanks and one engineer battalion, and they were relocated to Koprivnica in August 1990 to boost the JNA's presence in the town. A battlegroup comprising 23 armoured and 14 other vehicles, drawn from the 265th Mechanised Brigade and commanded by Lieutenant Colonel Milan Čeleketić, was deployed to Okučani. It was attached to the 5th Corps on 15 August to prevent Croatian special police from ousting Croatian Serb forces from the town.
Bjelovar also hosted the headquarters of the 28th Partisan Division (TO) and one of the division's brigades. The most significant JNA facility in Bjelovar and its immediate surroundings was the Božidar Adžija Barracks, situated on the western outskirts of the city. The barracks housed Bjelovar garrison headquarters and the bulk of the weaponry of the 265th Mechanised Brigade, and approximately 500 officers and soldiers. There was a JNA non-combat facility in the centre of Bjelovar, protected by a small security detail, a radar base and an anti-aircraft defence communications hub in the village of Zvijerci, adjacent to the settlement of Trojstveni Markovac on the northern outskirts of Bjelovar, and two storage depots. The Logor Depot was used to store tanks and other equipment of the 265th Mechanised Brigade and weapons that had been confiscated from the TO in Bjelovar, and was guarded by approximately 50 troops. The Barutana Depot was used to store ammunition. Unlike the Logor Depot, which was situated in the city itself, the Barutana Depot was located in the Bedenik Forest near Bjelovar.
Croatia established a company-sized special police unit in Bjelovar on 23 February 1991. Following the deterioration of the situation in western Slavonia, the 105th Brigade of the ZNG was raised in the city, largely equipped with small arms only, and plans for a blockade of the routes in and out of the city were developed. A crisis headquarters was set up to coordinate the defence of the city and the manufacture of weapons in industrial plants which had been modified for their production.
Timeline
Growing tensions and the blockade
The first significant conflict involving the JNA in the Bjelovar area occurred on 1 September, when 14 JNA officers and soldiers were disarmed at a Croatian checkpoint. The commanding officer of the Bjelovar JNA garrison, Colonel Rajko Kovačević, demanded that the weapons to be returned, however the Croatian forces declined the request, claiming that the weapons had already been sent to Zagreb. Tensions greatly increased after 18 ZNG troops from the 105th Brigade, deployed from Bjelovar, went missing during the Battle of Kusonje on 9 September. The civilian authorities in the city demanded that the JNA provide information on their fate, but the JNA declared it had no knowledge of the matter.