The Yugoslav Partisans formed operational detachments (Serbo-Croatian Latin: odredi) in Bosnia and Herzegovina after the German-led Axis invasion of Yugoslavia during World War II. These detachments were formed to conduct local operations against the occupying powers and those collaborating with them, and a total of 108 detachments were created in Bosnia and Herzegovina during the war. The detachments were named after a district, town, region or geographic feature, and ranged in size from 16 to 3,000 fighters. Larger detachments were usually divided into several companies or battalions. Some detachments had a very brief existence, whereas others existed for most of the war and a few were disestablished and re-established several times. Information on some small or short-lived detachments is very limited. There were also a significant number of independent battalions outside the detachment framework, but these are not included in the scope of this article.