What happened 1991 AD in Croatia

The Croatian military was in a much worse state than that of the Serbs. In the early stages of the war, lack of military units meant that the Croatian Police force would take the brunt of the fighting. The Croatian National Guard, the new Croatian military, was formed on 11 April 1991, and gradually developed into the Croatian Army by 1993.

While in Sotin, a Serb civilian was killed on 5 May when he was caught in a crossfire between Serb and Croat paramilitaries.

On 19 May 1991, the Croatian authorities held a referendum on independence with the option of remaining in Yugoslavia as a looser union. Serb local authorities issued calls for a boycott, which were largely followed by Croatian Serbs. The referendum passed with 94% in favor.

The newly constituted Croatian military units held a military parade and review at Stadion Kranjčevićeva in Zagreb on 28 May 1991.

On 6 June, Izetbegović and Macedonian president Kiro Gligorov proposed a weak confederation between Croatia, Slovenia and a federation of the other four republics, which was rejected by Milošević.

The parliament of Croatia declared Croatia's independence and dissolved its association with Yugoslavia on 25 June 1991.

On 25 June 1991, both Slovenia and Croatia declared independence, which led to a short armed conflict in Slovenia called the Ten-Day War, and an all-out war in Croatia in the Croatian War of Independence in areas with a substantial ethnic Serb population.

On the morning of 26 June, units of the Yugoslav People's Army's 13th Corps left their barracks in Rijeka, Croatia, to move towards Slovenia's borders with Italy.

In August 1991, the Battle of Vukovar began. The Battle of Vukovar was an 87-day siege of Vukovar in eastern Croatia by the Yugoslav People's Army (JNA), supported by various paramilitary forces from Serbia, between August and November 1991. Before the Croatian War of Independence the Baroque town was a prosperous, mixed community of Croats, Serbs and other ethnic groups. As Yugoslavia began to break up, Serbia's President Slobodan Milošević and Croatia's President Franjo Tuđman began pursuing nationalist politics. In 1990, an armed insurrection was started by Croatian Serb militias, supported by the Serbian government and paramilitary groups, who seized control of Serb-populated areas of Croatia. The JNA began to intervene in favour of the rebellion, and conflict broke out in the eastern Croatian region of Slavonia in May 1991. In August, the JNA launched a full-scale attack against Croatian-held territory in eastern Slavonia, including Vukovar.

This move followed months of standoff for JNA positions in Dalmatia and elsewhere now known as the Battle of the barracks.

In September 1991, Croatian National Guard (ZNG) organised armed incursions across the Croatian border into Bosnia. ZNG opened mortar fire on Bosanska Dubica on 13 September 1991, and raided Bosanski Brod on 15 September 1991.

It also coincided with the end of Operation Coast-91, in which the JNA failed to occupy the coastline in an attempt to cut off Dalmatia's access to the rest of Croatia.

On 20 September 1991, the JNA transferred troops to the front at Vukovar via the Višegrad region of northeastern Bosnia. In response, local Croats and Bosniaks set up barricades and machine-gun posts. They halted a column of 60 JNA tanks but were dispersed by force the following day. More than 1,000 people had to flee the area. This action, nearly seven months before the start of the Bosnian War, caused the first casualties of the Yugoslav Wars in Bosnia.

On October 3, the Yugoslav Navy renewed its blockade of the main ports of Croatia.

On October 5, President Tuđman made a speech in which he called upon the whole population to mobilize and defend against "Greater Serbian imperialism" pursued by the Serb-led JNA, Serbian paramilitary formations, and rebel Serb forces.

On 7 October, the Yugoslav air force attacked the main government building in Zagreb, an incident referred to as the bombing of Banski dvori.

The next day, as a previously agreed three-month moratorium on implementation of the declaration of independence expired, the Croatian Parliament severed all remaining ties with Yugoslavia. 8 October is now celebrated as Independence Day in Croatia.

On 15 October after the capture of Cavtat by the JNA, local Serbs led by Aco Apolonio proclaimed the Dubrovnik Republic.

Croatian forces made further advances in the second half of December, including Operation Orkan 91 which was a military offensive undertaken by the Croatian Army (Hrvatska vojska – HV) against the Yugoslav People's Army (Jugoslovenska Narodna Armija – JNA) and SAO Western Slavonia Territorial Defense Forces in the Sava River valley, in the region of Western Slavonia during the Croatian War of Independence. The operation began on 29 October 1991 and ended on 3 January 1992 when a nationwide ceasefire was signed to implement the Vance plan. The offensive was aimed at recapturing the region, in conjunction with two other HV offensives launched against SAO Western Slavonia in the north of the region within days.

Operation Otkos 10 (31 October to 4 November) resulted in Croatia recapturing an area between the Bilogora and Papuk mountains.

The Croatian army began a successful counterattack in early November 1991, its first major offensive operation of the war.

On 12 November 1991, the Croatian Community of Bosnian Posavina was established in Bosanski Brod. It covered eight municipalities in northern Bosnia.

On 14 November, the Navy blockade of Dalmatian ports was challenged by civilian ships. The confrontation culminated in the Battle of the Dalmatian channels, when Croatian coastal and island based artillery damaged, sank, or captured a number of Yugoslav navy vessels, including Mukos PČ 176, later rechristened PB 62 Šolta.

On December 21, 1991 for the first time in the war Istria was under attack.

Croatia lost much territory, but expanded the Croatian Army from the seven brigades it had at the time of the first ceasefire to 60 brigades and 37 independent battalions by December 31, 1991.