The Battle of Kupres (Bosnian, Croatian and ) was a battle of the Bosnian War, fought between the Army of the Republic of Bosnia and Herzegovina (ARBiH) and the Croatian Defence Council (HVO) on one side and the Army of Republika Srpska (VRS) on the other from 20 October to 3 November 1994. It marks the first tangible evidence of the Bosniak–Croat alliance set out in the Washington Agreement of March 1994, brokered by the United States to end the Croat–Bosniak War fought between the ARBiH and the HVO in Bosnia and Herzegovina. The ARBiH and the HVO were not coordinated at first, rather they launched separate operations aimed at capture of Kupres.

The ARBiH offensive, codenamed Autumn-94 (Jesen-94), started on 20 October, with the primary aim of advancing from Bugojno towards VRS-held Donji Vakuf, supported by a secondary attack towards Kupres aimed at disruption of the VRS defences and threatening a supply route to Donji Vakuf. The primary attacking force soon ground to a halt, shifting the focus of the operation to Kupres, where substantial reinforcements were deployed to ensure a gradual advance of the ARBiH. On 29 October, the HVO decided to attack, as it considered the ARBiH had directly threatened the strategic Kupres plateau. The HVO launched its offensive, codenamed Operation Cincar (Operacija Cincar), on 1 November. Following a brief lull in the ARBiH advance, thought to be brought on by a variety of causes and a direct request by the President of Bosnia and Herzegovina Alija Izetbegović to the ARBiH to cooperate with the HVO, commanding officers of the two forces met to coordinate their operations for the first time since the Washington Agreement. Kupres itself was captured by the HVO on 3 November 1994.

Besides the political significance of the battle for future developments of the war in Bosnia, the battle was militarily significant for planning and execution of Operation Winter '94 by the Croatian Army (HV) and the HVO aimed at relieving the siege of Bihać in late November and December 1994. Territorial gains made by the HVO and the ARBiH in the Battle of Kupres safeguarded the right flank of Operation Winter '94.

Background

The 1990 revolt of the Croatian Serbs was centered on the predominantly Serb-populated areas of the Dalmatian hinterland around the city of Knin, parts of Lika, Kordun, Banovina regions and in eastern Croatian settlements with significant Serb populations. These areas were subsequently named the Republic of Serbian Krajina (RSK). The RSK declared its intention of political integration with Serbia and was viewed by the Government of Croatia as a rebellion. By March 1991, the conflict escalated to war—the Croatian War of Independence. In June 1991, Croatia declared its independence as Yugoslavia disintegrated, followed by a three-month moratorium on the decision, thus the decision came into effect on 8 October. A campaign of ethnic cleansing was then initiated by the RSK against Croatian civilians and most non-Serbs were expelled by early 1993. By November 1993, less than 400 and 1,500–2,000 ethnic Croats remained in UN protected areas Sector South and Sector North respectively.

As the Yugoslav People's Army (JNA) increasingly supported the RSK and the Croatian police was unable to cope with the situation, the Croatian National Guard (ZNG) was formed in May 1991. The ZNG was renamed the Croatian Army (HV) in November. The establishment of the military of Croatia was hampered by a United Nations (UN) arms embargo introduced in September. The final months of 1991 saw the fiercest fighting of the war, culminating in the Battle of the barracks, the Siege of Dubrovnik, and the Battle of Vukovar.

In January 1992, the Sarajevo Agreement was signed by representatives of Croatia, the JNA and the UN, and fighting between the two sides paused. Ending the series of unsuccessful ceasefires, United Nations Protection Force (UNPROFOR) was deployed to Croatia to supervise and maintain the agreement. The conflict largely passed on to entrenched positions, and the JNA soon retreated from Croatia into Bosnia and Herzegovina, where a new conflict was anticipated, but Serbia continued to support the RSK. HV advances restored small areas to Croatian control—as the siege of Dubrovnik was lifted, and in Operation Maslenica. Croatian towns and villages were intermittently attacked by artillery, or missiles.

As the JNA disengaged in Croatia, its personnel prepared to set up a new Bosnian Serb army, as Bosnian Serbs declared the Serbian Republic of Bosnia and Herzegovina on 9 January 1992, ahead of 29 February – 1 March 1992 referendum on independence of Bosnia and Herzegovina—which would later be cited as a pretext for the Bosnian War. Bosnian Serbs set up barricades in the capital, Sarajevo and elsewhere on 1 March, and the next day the first fatalities of the war were recorded in Sarajevo and Doboj. In the final days of March, the Bosnian Serb army started artillery attacks on Bosanski Brod, and the HV 108th Brigade crossed the border adjacent to the town in reply. On 4 April, Serb artillery began shelling Sarajevo. Even though the war originally pitted Bosnian Serbs against non-Serbs in the country, it evolved into a three-sided conflict by the end of the year, as the Croat–Bosniak War started. By that time, the Bosnian Serb army—renamed Army of Republika Srpska (VRS) after the Republika Srpska state proclaimed in the Bosnian Serb-held territory—controlled about 70% of Bosnia and Herzegovina. That proportion would not change significantly over the next two years. Republika Srpska was involved in the Croatian War of Independence in a limited capacity, through military and other aid to the RSK, occasional air raids launched from Banja Luka, and most significantly through artillery attacks against urban centres.

Prelude

Following a new military strategy of the United States endorsed by Bill Clinton since February 1993, the Washington Agreement was signed by Croatia and Bosnia and Herzegovina in March 1994. The agreement ended the Croat–Bosniak War and established the Federation of Bosnia and Herzegovina. The political settlement allowed the ARBiH and the HVO to deploy additional troops against the VRS in a series of small-scale attacks designed to wear down the Bosnian Serb military, but the attacks claimed no territorial gains before October. The ARBiH adopted an attrition warfare strategy relying on its numerical superiority compared to the VRS, which suffered from manpower shortages. This strategy aimed for limited advances, without support of heavy weapons and means of transport—unavailable to the ARBiH at the time.

In March–November 1994, the ARBiH conducted a series of attacks with relatively limited objectives, attacking the VRS at the Vlašić Mountain, the Stolice Peak of the Majevica Mountain and Donji Vakuf, as well as in the area between Tešanj and Teslić, near Brčko, Kladanj, Sarajevo, on the Bjelašnica and the Treskavica Mountain, Gračanica, Vareš, Konjic and Doboj. Further efforts were made, together with the HVO, against the VRS near Nevesinje in September–November, but most of the offensives made little or no gains. At the same time, VRS attacks north of Sarajevo were successfully repulsed. It was hoped by the ARBiH General Staff that the VRS could not muster sufficient reserves to hold off the simultaneous, relatively limited attacks. Little territory changed hands as a result of the ARBiH offensive by the end of October, but the VRS shortage of troops worsened.

Kupres was of interest to the ARBiH and the HVO, albeit for different reasons. The HVO sought to recapture the town, which had been lost in April 1992, and had been home to a significant Croat community before the war, and to gain control of the Tomislavgrad–Bugojno–Šipovo road. The ARBiH advance towards Kupres was planned as a secondary axis of its offensive towards Donji Vakuf, to the northwest, codenamed Autumn-94. The ARBiH wanted to deny the VRS a supply route passing through Kupres in order to weaken VRS defences around Donji Vakuf.

It is not clear how the ARBiH and the HVO coordinated before their advance to Kupres. Most probably, the two forces' commands agreed on a simultaneous offensive against Kupres, without revealing actual battle plans to their counterparts. The HVO's contribution in the offensive, codenamed Operation Cincar, was planned jointly by the HVO and the HV.

Order of battle Initially, the ARBiH committed 3,130 troops to its secondary axis—the thrust towards Kupres. They were organized with the 370th Mountain Infantry Brigade on the right flank of the front manned by the ARBiH 7th Corps southwest of Bugojno, and the 307th Mountain Infantry Brigade on the left flank of the ARBiH effort. In the primary attack axis zone, the ARBiH grouped about 5,600 additional troops, facing an estimated 4,800 VRS soldiers around Donji Vakuf. Kupres itself and the surrounding plateau were defended by approximately 2,700 VRS troops, assigned to the 7th Motorized Infantry Brigade of the 2nd Krajina Corps, supported by corps-level artillery and armour. The bulk of the HVO force consisted of troops contributed by the 1st, the 2nd and the 3rd Guards Brigades, supported by the Bosnian Croat special police and the 60th Guards Airborne Battalion "Ludvig Pavlović". Although participation of the HV in the battle was denied by Croatia, it is thought to have likely occurred. Specifically, the 1st Croatian Guards Brigade is thought to have taken part in the battle, and Bosnian Croat reports pertaining to the battle specify the Zrinski Battalion of the brigade as taking part in the operation. The ARBiH 7th Corps was commanded by Brigadier General Mehmed Alagić, while the HVO Tomislavgrad Corps, formally in control of Operation Cincar, was commanded by Colonel Josip Černi. The VRS 2nd Krajina Corps was under command of Colonel Radivoje Tomanić.

+Army of the Republic of Bosnia and Herzegovina deployments in Operation Autumn-94 Corps Unit Note 7th Corps 307th Mountain Infantry Brigade Initial deployment 370th Mountain Infantry Brigade Initial deployment 317th Mountain Infantry Brigade Added on 20 October 305th Mountain Infantry Brigade Elements added on 21 October 37th Light Infantry Brigade Added on 27 October 27th Mountain Infantry Brigade Elements added on 27 October 1 battalion of the 7th Mountain Infantry Brigade Conscript unit, added on 27 October General Staff Guards Brigade Added on 28 October

+Croatian Defence Council deployments in Operation Cincar Corps Unit Note Tomislavgrad Corps 1st Guards Brigade "Ante Bruno Bušić" 2nd Guards Brigade 3rd Guards Brigade “Jastrebovi” (Hawks) Special Purpose Unit "Ludvig Pavlović" 1st Home Guard Regiment Elements only, HQ Posušje 79th Home Guard Regiment "King Tomislav" Elements only, HQ Tomislavgrad 80th Home Guard Regiment "Petar Krešimir IV" Elements only, HQ Livno Special police Bosnian Croat Ministry of Interior unit 1st Croatian Guards Brigade (Croatian Army)

+Army of Republika Srpska deployments in Operations Autumn-94 and Cincar Corps Unit Note 2nd Krajina Corps 7th Motorized Infantry Brigade Corps level artillery and armour reinforcing the 7th Brigade

Timeline October