In the aftermath of the Battle of Osijek, Croatian authorities charged thirteen JNA officers with war crimes against civilians, but no arrests have been made to date.The Yugoslav People's Army (Jugoslovenska Narodna Armija – JNA) confiscated the weapons of Croatia's Territorial Defence (Teritorijalna obrana – TO) to minimize potential resistance.[2] The revolt took place in the predominantly Serb-populated areas of the Dalmatian hinterland around Knin[3] and in parts of the Lika, Kordun, Banovina regions and eastern Croatia.[5] After a bloodless skirmish between Serb insurgents and Croatian special police in March,[6] the JNA itself, supported by Serbia and its allies, asked the federal Presidency to grant it wartime powers and declare a state of emergency.[23] During its height, the intensity of the bombardment was reported to reach as high as one shell per minute,[28] and the artillery attacks were compounded by Yugoslav Air Force strikes against the city.[12] On the same day, an armoured JNA force unsuccessfully attacked positions held by the Croatian 106th Brigade in Rosinjača Forest near Nemetin, approximately two kilometres (1.2 miles) east of Osijek.[40] On 11 December, HV personnel entered the frontline village of Paulin Dvor, less than three kilometres (1.9 miles) west of Ernestinovo,[12] and summarily executed 19 civilians (18 Serbs and one Hungarian).[34] Advances of the JNA north of Osijek threatened HV control of a narrow bridgehead held across the Drava River skirting the city's northern edge.In order to remove the threat, the HV launched an offensive codenamed Operation Devil's Beam (Croatian: Operacija Đavolja greda) on 17–18 December.The offensive, involving the 1st Battalion of the 135th Brigade, elements of the special forces Frankopan Battalion and the Osijek-based Orao special police unit, Drava River flotilla, artillery of the 106th Brigade,[44] and personnel of the 4th Beli Manastir Police Station,[45] successfully pushed the JNA north, across Stara Drava oxbow lake located approximately four kilometres (2.5 miles) north of Osijek.[55] Although the United Nations Protection Force peacekeepers deployed to the area on the basis of the Vance plan and placed most of the ARSK heavy weapons in storage,[56] Osijek was intermittently bombarded throughout the war—the last artillery strike occurred in September 1995.[59] In 2005, the Osijek District Court convicted former Croatian soldier Nikola Ivanković for his involvement in the killings at Paulin Dvor, and sentenced him to 15 years in prison.