Operation Storm (Croatian: Operacija Oluja) was a large-scale military offensive conducted by the Croatian Army (HV) and special police of the Republic of Croatia between August 4 and August 7, 1995, during the final stages of the Croatian War of Independence. Its primary objective was the recapture of Croatian territories held by the self-proclaimed Republic of Serb Krajina (RSK), which had been established by ethnic Serbs with the support of the Yugoslav People's Army (JNA) and Serbia since 1991. The operation resulted in a decisive Croatian victory, the collapse of the RSK, and the reintegration of most of these territories into Croatia.
Background
The Croatian War of Independence began in 1991 following Croatia's declaration of independence from Yugoslavia. Ethnic Serbs in Croatia, fearing their minority status in an independent Croatia and encouraged by Belgrade, rebelled and established the RSK, controlling approximately one-third of Croatian territory, primarily in the regions of Krajina, Western Slavonia, and Eastern Slavonia. The conflict was marked by brutal fighting, ethnic cleansing, and the intervention of the United Nations Protection Force (UNPROFOR) to maintain a fragile ceasefire.
Throughout 1992-1994, several peace plans failed, and Croatia gradually built up its military capabilities, receiving training and equipment from various foreign sources. In May 1995, Croatia successfully carried out Operation Flash, swiftly regaining control over Western Slavonia. This success demonstrated Croatia's increased military strength and resolve. The international community, particularly the United States, began to shift its policy, tacitly supporting Croatia's efforts to end the war, especially after the Srebrenica massacre in July 1995, which highlighted the ineffectiveness of UN "safe areas" and the broader instability in the region.
Planning and Preparations
The planning for Operation Storm began months in advance, with Croatian military leadership under President Franjo Tuđman and General Zvonimir Červenko meticulously preparing for a major offensive. The strategy involved a rapid, multi-pronged attack designed to overwhelm RSK defenses, cut off their supply lines, and quickly seize key strategic points, including the RSK capital, Knin. The Croatian Army deployed approximately 150,000-200,000 troops, supported by tanks, artillery, and airpower, vastly outnumbering the estimated 30,000-40,000 forces of the Army of the Republic of Serb Krajina (SVK).
The Offensive (August 4-7, 1995)
August 4, 1995 (Day 1): The offensive began at 05:00 with a massive artillery barrage targeting RSK command posts, logistical centers, and front-line positions along a 630 km (390 mi) front. Croatian forces launched simultaneous attacks across multiple sectors. Rapid breakthroughs were achieved in the Lika and Banija regions. By the end of the day, Croatian forces had cut several key RSK communication routes and were making significant advances towards Knin.
August 5, 1995 (Day 2): Croatian forces continued their swift advance. The 7th Guards Brigade and 4th Guards Brigade entered Knin, the capital of the RSK, raising the Croatian flag over the Knin Fortress. The fall of Knin effectively signaled the collapse of the RSK's military and political leadership. Faced with the rapid Croatian advance and the disintegration of their command structure, the RSK leadership ordered the evacuation of the Serb civilian population from Krajina.
August 6-7, 1995 (Days 3-4): Croatian forces consolidated their gains, pushing further into RSK territory and securing most of the remaining areas. Mop-up operations were conducted, and pockets of resistance were eliminated. Croatian forces linked up with the Army of the Republic of Bosnia and Herzegovina (ARBiH) near the border, completing the encirclement of Bosnian Serb forces in Bihać. By August 7, the Croatian General Staff declared Operation Storm completed.
Consequences and Aftermath
Operation Storm was a decisive military victory for Croatia, bringing an end to the Croatian War of Independence.
- Military Outcome: The RSK was militarily defeated and politically dissolved. Croatia regained control over approximately 10,400 square kilometers (4,000 sq mi) of territory. The only remaining Serb-held territory in Croatia was Eastern Slavonia, which was peacefully reintegrated through the Erdut Agreement in 1998.
- Demographic Impact and Humanitarian Crisis: The operation led to a massive exodus of the Serb population from Krajina. Over 200,000 Serbs fled or were expelled from the region, primarily to Serbia and Bosnia and Herzegovina. This displacement constitutes one of the largest refugee movements in Europe since World War II and remains a highly controversial aspect of the operation, with different interpretations regarding its voluntary or forced nature.
- Impact on the Bosnian War: Operation Storm significantly altered the balance of power in the Bosnian War. It allowed Croatian and Bosnian forces to launch further joint offensives (e.g., Operation Mistral and Operation Southern Move), weakening the Army of Republika Srpska and ultimately paving the way for the Dayton Agreement in November 1995, which ended the Bosnian War.
- War Crimes and Controversies: While Croatia views Operation Storm as a legitimate act of liberation, the operation was also accompanied by allegations of war crimes committed against Serb civilians and the destruction of Serb property. The International Criminal Tribunal for the former Yugoslavia (ICTY) indicted Croatian Generals Ante Gotovina, Mladen Markač, and Ivan Čermak for their roles in the operation. While Čermak was acquitted, Gotovina and Markač were initially convicted in 2011, but their convictions were overturned on appeal in 2012, with the appeals chamber concluding that there was no joint criminal enterprise to ethnically cleanse Serbs. The court did acknowledge that individual crimes were committed, but found insufficient evidence linking them to the Croatian military or political leadership's intent to commit such crimes as part of a systematic plan.
- Legacy: In Croatia, August 5 is celebrated annually as Victory and Homeland Thanksgiving Day and the Day of Croatian Defenders, commemorating the successful conclusion of the war and the liberation of the country. In Serbia and among many Krajina Serbs, Operation Storm is remembered as a forced expulsion and ethnic cleansing, leading to ongoing tensions and differing narratives about the conflict.