The Kozara Offensive , also known as Operation West-Bosnien by the Axis , was fought Hostile_encounter in 1942 on and around the mountain of Kozara in northwestern Bosnia .

The Kozara Offensive , also known as Operation West-Bosnien by the Axis , was fought Hostile_encounter in 1942 on and around the mountain of Kozara in northwestern Bosnia .

Certain sources mistakenly identify Check the Kozara Offensive as part of Operation Trio .

The free territory stretched Expansion from the river Sava south across the mountains Kozara and Grmeč .

During and after the battle , many thousands of Serbian civilians from Kozara were sent Sending to the Ustaše Jasenovac concentration camp .