Operation Mistral 2, officially codenamed Operation Maestral 2, was a Croatian Army (HV) and Croatian Defence Council (HVO) offensive in western Bosnia and Herzegovina on 8–15 September 1995 as part of the Bosnian War. Its objective was to create a security buffer between Croatia and positions held by the Bosnian Serb Army of Republika Srpska (VRS). The operation also spearheaded a Herzeg-Croat led move to compromise the occupation of the largest Bosnian Serb-held city, Banja Luka, by capturing the towns of Jajce, Šipovo and Drvar. Thus jeopardizing the operations capacity of Banja Luka and ultimately leading to its recapture. The combined HV and HVO forces were under the overall command of HV Major General Ante Gotovina.
The operation commenced during a North Atlantic Treaty Organization (NATO) air campaign against the VRS codenamed Operation Deliberate Force, targeting VRS air defences, artillery positions and storage facilities largely in the area of Sarajevo, but also elsewhere in the country. Days after commencement of the offensive, the VRS positions to the right and to the left of the HV and the HVO advance were also attacked by the Army of the Republic of Bosnia and Herzegovina (ARBiH) in Operation Sana. The offensive achieved its objectives and set the stage for further advances of the HV, HVO and ARBiH towards Banja Luka, contributing to the resolution of the war.
There is disagreement among scholars as to whether the offensive, together with Operation Sana, or NATO airstrikes contributed more towards the resolution of the Bosnian War, and to what extent ARBiH, HVO and HV advances were aided by NATO airstrikes. Operation Mistral 2 resulted in the deaths of hundreds of Bosnian Serb civilians, as well as the displacement of tens of thousands of others. In 2011, five former Croatian military personnel were convicted of war crimes for the summary execution of five Bosnian Serb soldiers and a civilian during the operation. In 2016, Bosnian Serb officials filed a criminal complaint against the Croatian Minister of Defence, Damir Krstičević, alleging that he had committed war crimes during the offensive.
Background
As the Yugoslav People's Army (Jugoslovenska narodna armija – JNA) withdrew from Croatia following the acceptance and start of implementation of the Vance plan, its 55,000 officers and soldiers born in Bosnia and Herzegovina were transferred to a new Bosnian Serb army, which was later renamed the Army of Republika Srpska (Vojska Republike Srpske – VRS). This re-organisation followed the declaration of the Serbian Republic of Bosnia and Herzegovina on 9 January 1992, ahead of the referendum on the independence of Bosnia and Herzegovina that took place between 29 February and 1 March 1992. This declaration would later be cited by the Bosnian Serbs as a pretext for the Bosnian War. Bosnian Serbs began fortifying the capital, Sarajevo, and other areas on 1 March 1992. On the following day, the first fatalities of the war were recorded in Sarajevo and Doboj. In the final days of March, Bosnian Serb forces bombarded Bosanski Brod with artillery, resulting in a cross-border operation by the Croatian Army (Hrvatska vojska – HV) 108th Brigade. On 4 April 1992, JNA artillery began shelling Sarajevo. There were other examples of the JNA directly supported the VRS, such as during the capture of Zvornik in early April 1992, when the JNA provided artillery support from Serbia, firing across the Drina River. At the same time, the JNA attempted to defuse the situation and arrange negotiations elsewhere in the country.