Tito came to Drvar at the end of January 1943, during a major Axis offensive against the Partisans (code-named "Fall Weiss" in German). After consulting with Đuro Pucar, the head of the KPJ regional committee for Bosanska Krajina, Tito decided to form a Partisan brigade around a battalion of experienced fighters from Drvar. Additional manpower would consist of recovered Partisans who had been wounded or ill, older men not previously in combat units and young male and female volunteers. The four-battalion 10th Krajina Brigade, intended to play a primarily-defensive role at this stage, was established on 4 February 1943; its 800 members included about 120 women. Bursać, one of the volunteers, was assigned to the 2nd Battalion and was transferred to the 3rd Battalion's 3rd Company the following month. Until September 1943, she fought the Ustaše, Germans, Italians, and anti-communist Chetniks around Grahovo, Knin, Vrlika, Livno and Mount Dinara, was commended for her courage and skill in combat, and served as a nurse. In February and March 1943, during the Axis offensive, the brigade experienced constant enemy attacks, food shortages, cold, deep snow and outbreaks of typhus. Emaciated, Bursać was transferred to the military kitchen at brigade headquarters at the beginning of spring; after a month, she was returned to her company at her insistence. When she became ill some time later, Bursać was sent home to recover.