The Kozara Offensive (also known as Operation West-Bosnien) was fought in 1942 on and around the mountain of Kozara in northwestern Bosnia. It was an important battle of the Yugoslav Partisan resistance movement in

World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...

. It later became an integral part of Yugoslav post-war mythology, which celebrated the courage and martyrdom of outnumbered and outgunned Partisans and civilians. Certain sources mistakenly identify the Kozara Offensive as part of

Operation Trio Operation Trio ( sh-Latn, Operacija Trio) was the first large-scale joint German-Italian counter-insurgency operation of World War II conducted in the Independent State of Croatia (NDH), which included modern-day Bosnia and Herzegovina. It was ...

Operation

In the spring of 1942, Yugoslav Partisans in central and west

Bosnia Bosnia and Herzegovina ( sh, / , ), abbreviated BiH () or B&H, sometimes called Bosnia–Herzegovina and Pars pro toto#Geography, often known informally as Bosnia, is a country at the crossroads of Southern Europe, south and southeast Euro ...

liberated Bosanski Petrovac,

Drvar Drvar (, ) is a town and municipality located in Canton 10 of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. The 2013 census registered the municipality as having a population of 7,036. It is situated in western Bos ...

Glamoč Glamoč ( sr-cyrl, Гламоч) is a town and municipality located in Canton 10 of the Federation of Bosnia and Herzegovina, an entity of Bosnia and Herzegovina. It is situated in southwestern Bosnia and Herzegovina, at the foothills of Stareti ...

and

Prijedor Prijedor ( sr-cyrl, Приједор, ) is a city and municipality located in the Republika Srpska entity of Bosnia and Herzegovina. As of 2013, it has a population of 89,397 inhabitants within its administrative limits. Prijedor is situated in ...

. On 20 May the 1st Krajina Assault Brigade was founded, and the next day it obtained

tank A tank is an armoured fighting vehicle intended as a primary offensive weapon in front-line ground combat. Tank designs are a balance of heavy firepower, strong armour, and good battlefield mobility provided by tracks and a powerful ...

s and a modest

air force An air force – in the broadest sense – is the national military branch that primarily conducts aerial warfare. More specifically, it is the branch of a nation's armed services that is responsible for aerial warfare as distinct from an ...

. The free territory stretched from the river

Sava The Sava (; , ; sr-cyr, Сава, hu, Száva) is a river in Central and Southeast Europe, a right-bank and the longest tributary of the Danube. It flows through Slovenia, Croatia and along its border with Bosnia and Herzegovina, and finally t ...

south across the mountains Kozara and Grmeč. During the winter, Partisans inflicted heavy casualties on the Germans. A great loss for the Partisans was the death of their capable and distinguished commander, Mladen Stojanović, known as "Komandant Mladen". The

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ge ...

and

Ustaše The Ustaše (), also known by anglicised versions Ustasha or Ustashe, was a Croats, Croatian Fascism, fascist and ultranationalism, ultranationalist organization active, as one organization, between 1929 and 1945, formally known as the Ustaš ...

authorities realized that the city of

Banja Luka Banja Luka ( sr-Cyrl, Бања Лука, ) or Banjaluka ( sr-Cyrl, Бањалука, ) is the second largest city in Bosnia and Herzegovina and the largest city of Republika Srpska. Banja Luka is also the ''de facto'' capital of this entity. ...

and the iron mine in Ljubija were in danger and organized an offensive to destroy the movement. The Germans engaged 15,000 soldiers, the

Independent State of Croatia The Independent State of Croatia ( sh, Nezavisna Država Hrvatska, NDH; german: Unabhängiger Staat Kroatien; it, Stato indipendente di Croazia) was a World War II-era puppet state of Nazi Germany and Fascist Italy (1922–1943), Fascist It ...

about 21,000 soldiers, and the Hungarians participated with 5 monitor ships. The Partisan group had about 3,000 soldiers. After an intensive battle on the night of 3 July, some partisan units broke the siege, but the main group again came under siege the next night and was mostly destroyed. In Široka Luka about 500 wounded Partisans were killed. It is estimated that during the battle, the Partisans lost about 1,700 soldiers, while the Axis forces lost about 7,000. During and after the battle, many thousands of

Serbian Serbian may refer to: * someone or something related to Serbia, a country in Southeastern Europe * someone or something related to the Serbs, a South Slavic people * Serbian language * Serbian names See also * * * Old Serbian (disambiguation ...

civilians from Kozara were sent to the Ustaše Jasenovac concentration camp. About 900 Partisan soldiers survived and founded the Fifth Krajina Brigade. At the same time, the main Partisan group with

Josip Broz Tito Josip Broz ( sh-Cyrl, Јосип Броз, ; 7 May 1892 – 4 May 1980), commonly known as Tito (; sh-Cyrl, Тито, links=no, ), was a Yugoslav communist revolutionary and statesman, serving in various positions from 1943 until his death ...

moved from East Bosnia to West Bosnia. After the Axis offensive forces withdrew, parts of the lost area were regained in September 1942. Approximately 25,000

Serbs The Serbs ( sr-Cyr, Срби, Srbi, ) are the most numerous South Slavs, South Slavic ethnic group native to the Balkans in Southeastern Europe, who share a common Serbian Cultural heritage, ancestry, Culture of Serbia, culture, History of ...

were killed in the operation, mostly in concentration camps. During German military operation large group of mostly civilians was captured, 10,000 of them were brought from Kozara to

Sajmište concentration camp The Sajmište concentration camp () was a Nazi German concentration and extermination camp during World War II. It was located at the former Belgrade fairground site near the town of Zemun, in the Independent State of Croatia (NDH). The camp was ...

.Byford, Jovan; (2011) ''Staro sajmište: mesto sećanja, zaborava i sporenja. Beogradski centar za ljudska prava'' p. 45; Zločin ustaša na Kozari 1942

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Operation

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