Slovenia and
Croatia passed their acts of independence on 25 June 1991. This "advance" on the date of independence was a critical element of the Slovenian plan to gain an early advantage in the expected conflict. The Slovenian government fully expected the Yugoslav military to respond with force on the day of the declaration of independence or shortly afterwards. By secretly advancing the date by 24 hours, the Slovenians caught the Yugoslav government off guard, which had set 26 June as the date for its move. Although the JNA was adamantly opposed to Slovenian independence, it was divided about what to do. The JNA Chief of Staff, Colonel-General
Blagoje Adžić, advocated a large-scale military operation to remove the Slovenian government and bring "healthy forces" to power in the republic. His political superior, the Yugoslav defence minister, General of the Army
Veljko Kadijević, insisted on a more cautious approach – essentially a show of force that would convince the Slovenian government to back down on its declaration of independence. After some debate, Kadijević got his way. It is unclear how much the civilian members of the Yugoslav government were involved in the decision to resort to force in Slovenia.
Ante Marković, the president of the Federal Executive Council (equivalent to prime minister) is reported to have said that the federal government had not been informed of the Army's actions.
26 June 1991 On the morning of 26 June, units of the JNA's 13th Corps left their barracks in
Rijeka, Croatia, to move towards Slovenia's borders with Italy. The move immediately led to a strong reaction from local Slovenians, who organized spontaneous barricades and demonstrations against the JNA's actions. By this time, the Slovenian government had already put into action its plan to seize control of the republic's border posts and the
international airport at Brnik. The personnel manning the border posts were, in most cases, already Slovenians, so the Slovenian take-over mostly simply amounted to changing of uniforms and insignia, without any fighting. This was undertaken, in the words of Janez Janša, to "establish our sovereignty in the key triangle, border-customs-air control".
27 June 1991 border crossing Further JNA troop movements took place in the early hours of 27 June. A unit of the JNA's 306th Anti-Aircraft Regiment, based in
Karlovac, Croatia, crossed the Slovenian border at
Metlika. A few hours later, a column of tanks and armoured personnel carriers of the JNA 1st Armoured Brigade left their barracks at
Vrhnika near Ljubljana, heading for the airport at Brnik. They arrived a few hours later and took control of the facilities. As the JNA was the federal army, its forces were customarily deployed in various places within the federal republics including Slovenia. To the east, JNA units left
Maribor heading for the nearby border crossing at
Šentilj and the border town of
Dravograd further west. The
Yugoslav Air Force aircraft dropped leaflets over various parts of Slovenia bearing the messages "We invite you to peace and cooperation!" and "All resistance will be crushed." The Slovenian government had received warnings that the JNA would use helicopters to ferry
special forces troops to strategic locations. It issued a warning to the JNA's 5th Military Command District in
Zagreb that if helicopters continued to be used they would be shot down. The warning was disregarded by the JNA leadership, which still believed that the Slovenians would back down rather than fight. This was, however, a disastrous miscalculation. In the afternoon of 27 June, the Slovenian TO shot down two JNA helicopters with SA-7 missiles, one of them a
Gazelle over
Rožna Dolina, Ljubljana, killing the occupants, one of whom,
Toni Mrlak, was a Slovenian pilot, as the JNA's forces consisted of nationals from all the republics. It was later discovered that the Gazelle which Mrlak had been flying was unarmed, and was carrying only bread for the Yugoslav soldiers. The Slovenian TO also took up positions around JNA barracks in various locations, effectively besieging them, and launched a series of attacks on JNA forces across Slovenia. At Brnik, a Slovenian TO unit attacked the JNA troops holding the airport, and at
Trzin a firefight developed in which four JNA soldiers and one Slovenian TO soldier (
Edvard Peperko) were killed and the remainder of the JNA unit was forced to surrender. Attacks were also launched by Slovenian TO units on JNA tank columns at
Pesnica,
Ormož and
Koseze near Ilirska Bistrica. A tank column from the JNA's 32nd Mechanised Brigade, advancing from
Varaždin in Croatia, was blocked at Ormož near the Slovenian border and found itself unable to break through a Slovenian barricade. Despite the confusion and fighting, the JNA nonetheless successfully accomplished much of its military mission. By midnight on 27 June it had captured all of the crossings along the Italian border, all but three crossings on the Austrian border and several of the new crossing points established along Slovenia's border with Croatia. However, many of its units were still stuck in vulnerable positions across Slovenia.
28 June 1991 During the night of 27–28 June, Slovenian TO units were ordered to undertake a general offensive against the JNA. The Slovenian defence ministry ordered: At all locations where RS (Republic of Slovenia) armed forces (Slovenian Territorial Defence) have the tactical advantage, offensive actions against enemy units and facilities will be carried out. The enemy will be summoned to surrender, the shortest deadline possible for surrender given and action taken using all available weapons. While in action, any necessary arrangements will be made to evacuate and protect the civilians. Additional fighting took place throughout the day. The JNA tank column that had been attacked at Pesnica the previous day was blocked by impromptu barricades of Slovenian trucks at
Štrihovec, a few kilometres short of the border with Austria, where it again came under attack by Slovenian TO personnel and Slovenian police. The Yugoslav Air Force mounted two airstrikes in support of the JNA forces at Strihovec, killing four truck drivers. At
Medvedjek in central Slovenia, another JNA tank column came under attack at a truck barricade, where air raids killed six truck drivers. Heavy fighting broke out at
Nova Gorica on the border with Italy, where the Slovenian special forces fired two Armbrust antitank rockets and 700 rounds from infantry weapons. Slovene troops destroyed two JNA
T-55 tanks and captured an additional three, plus a
BTS-1 military engineering vehicle. Three JNA soldiers were killed and 16 wounded, among them the commander of the armoured column, and 98 surrendered. Some sources claim that this was the decisive battle of the war. The border crossing at
Holmec was captured by Slovenian TO forces. Two Slovenian and three JNA soldiers were killed, and 45 JNA soldiers captured. The Yugoslav Air Force also attacked the Slovenian TO military headquarters at
Kočevska Reka and flew sorties against radio and television transmitters at
Krim,
Kum,
Trdina Peak, and
Nanos in an attempt to silence the Slovenian government broadcasts. By the end of the day, the JNA still held many of its positions but was rapidly losing ground. JNA was beginning to experience problems with desertions – many Slovenian members of the JNA quit their units or simply changed sides – and both the troops on the ground and the leadership in Belgrade appeared to have little idea of what to do next.
29 June 1991 The outbreak of the war galvanised diplomatic efforts by the
European Community to find an end to the crisis. Three EC foreign ministers met with Slovenian and Yugoslav government representatives in Zagreb during the night of 28–29 June and agreed on a ceasefire plan, but this was not put into practice. In the morning, the Slovenians achieved several significant military successes. The JNA troops near Brnik surrendered to Slovenian TO forces, who had surrounded the airport overnight. In the north, several JNA tanks were captured near Strihovec and later reorganised into a TO tank company. JNA special forces attempted a maritime landing at
Hrvatini but were ambushed and repulsed by the Slovenians, suffering two dead and three wounded. The JNA-held border crossings at
Vrtojba and Šentilj also fell to the Slovenian TO, who seized the troops' weapons and tanks, providing a much-needed boost to their arsenal.
4–6 July 1991 With a ceasefire now in force, the two sides disengaged. Slovenian forces took control of all of the country's border crossings, and JNA units were allowed to withdraw peacefully to barracks and to cross the border to Croatia.
7 July 1991 and afterwards The Ten-Day War was formally ended with the
Brioni Accord, signed on the Croatian
Brijuni Islands. It was agreed that Slovenia and Croatia would postpone their independence for three months, dependent on the continuation of the ceasefire and the Slovenian police and armed forces (TO) were recognised as sovereign on their territory. It was agreed that all Yugoslav military units would leave Slovenia, with the Yugoslav government setting a deadline of the end of October to complete the process. The Slovenian government insisted that the withdrawal should proceed on its terms; the JNA was not allowed to take much of its heavy weaponry and equipment, which was later either deployed locally or sold to other Yugoslav republics. The withdrawal began about ten days later and was completed by 26 October. ==Casualties==