The Chetniks were originally formed as a guerrilla movement to resist Austro-Hungarian rule in the Balkans during the early 20th century. However, after the assassination of Archduke Franz Ferdinand in 1914, which sparked World War I, the Chetniks expanded their objectives to include the creation of a Greater Serbia. They pursued this goal by fighting alongside the Allies against Austria-Hungary and the Ottoman Empire.
During World War II, the Chetniks resumed their resistance activities, initially against Nazi Germany and Fascist Italy. However, their goal of creating a Greater Serbia often conflicted with the broader Allied objectives of defeating the Axis powers. The Chetniks engaged in collaboration with the Axis forces on several occasions, and they were also accused of committing atrocities against non-Serbian populations.
The plan for Greater Serbia involved annexing territories primarily from Bosnia and Herzegovina, Croatia, and Kosovo, where significant Serbian populations resided. The Chetniks believed that these territories rightfully belonged to Serbia based on historical, cultural, and ethnic claims. They aimed to establish a unified and independent Serbian state by incorporating these regions into Serbia.
Ultimately, the plan to create a Greater Serbia was never fully realized. After World War II, the Chetniks were defeated by the Yugoslav Partisans led by Josip Broz Tito. The newly established Socialist Federal Republic of Yugoslavia aimed to promote unity and equality among its constituent republics, including Serbia. The dream of a Greater Serbia remained a nationalist aspiration for some but faced opposition from other ethnic groups in the region and was never successfully implemented.