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|caption=Objectives of Operation Una (6px) on the map of Bosnia and Herzegovina | partof = the Bosnian War | place = Western Bosnia and Herzegovina | date = 18–19 September 1995 | result = Croatian Army defeat *Operation aborted *No territorial changes | combatant1 = | combatant2 = | commander1 = Vinko Vrbanac Marijan Mareković Luka Džanko | commander2 = Momir Talić | strength1 = 6,400 troops | strength2 = unknown | casualties1 = 49 killed | casualties2 = 50 killed 62 wounded 3 captured | casualties3 = 54 Serb civilians killed, 39 wounded and 6 captured 2 UNCRO peacekeepers killed in the VRS shelling of Dvor | notes = a After the war, Croatian General Janko Bobetko estimated Croatian losses as 70 killed and 250 wounded, though Croatian Government statistics contradict his claim }} Operation Una ((クロアチア語:Operacija Una)) was a military offensive conducted by the Croatian Army (''Hrvatska vojska'' – HV) against the Army of Republika Srpska (''Vojska Republike Srpske'' – VRS) in western Bosnia and Herzegovina on 18–19 September 1995, during the Bosnian War. The operation entailed a crossing of the Una and Sava rivers to establish bridgeheads at Novi Grad, Bosanska Dubica, Bosanska Kostajnica and opposite Jasenovac to allow for a subsequent advance towards Prijedor and Banja Luka. The operation was planned in a matter of hours following a meeting between Croatian President Franjo Tuđman and U.S. diplomat Richard Holbrooke, during which Holbrooke urged Tuđman to seize Prijedor and threaten to capture Banja Luka from the VRS, short of actually seizing the city, as he believed such a development would force Bosnian Serb leaders to the negotiating table. Inadequate planning and preparation, combined with flawed military intelligence on the defending force and disregard for the high water level of the Una and Sava rivers, led to a high number of casualties and little success. The offensive was called off one day after it was launched and the bridgeheads were evacuated. The HV ultimately blamed Major General Vinko Vrbanac for its failure. Vrbanac had authorized the offensive instead of deferring to the Chief of the General Staff General Zvonimir Červenko. Operation Una was the only unsuccessful operation by the HV from a series of offensives which had commenced in November 1994. It was controversial in the Croatian media, but was generally brushed aside as an aberration from a series of successes. In 2006, Croatian authorities launched an investigation into alleged war crimes committed by HV soldiers during the operation, in which 40 Serb civilians were killed. ==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. The JNA and the VRS in Bosnia and Herzegovina faced the Army of the Republic of Bosnia and Herzegovina (''Armija Republike Bosne i Hercegovine'' – ARBiH) and the Croatian Defence Council (''Hrvatsko vijeće obrane'' – HVO), reporting to the Bosniak-dominated central government and the Bosnian Croat leadership respectively, as well as the HV, which occasionally supported HVO operations. In late April, the VRS was able to deploy 200,000 troops, hundreds of tanks, armoured personnel carriers (APCs) and artillery pieces. The HVO and the Croatian Defence Forces (''Hrvatske obrambene snage'' – HOS) could field approximately 25,000 soldiers and a handful of heavy weapons, while the ARBiH was largely unprepared with nearly 100,000 troops, small arms for less than a half of their number and virtually no heavy weapons. Arming of the various forces was hampered by a United Nations (UN) arms embargo introduced in September 1991. By mid-May 1992, when those JNA units which had not been transferred to the VRS withdrew from Bosnia and Herzegovina to the newly declared Federal Republic of Yugoslavia, the VRS controlled approximately 60 percent of Bosnia and Herzegovina. The extent of the control was extended to about 70 percent of the country by the end of the year. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Operation Una」の詳細全文を読む スポンサード リンク
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