In the early morning of 3 October 1944, the Partisan 28th Slavonia Division assaulted a squadron of the reconnaissance battalion at Janja close to the Drina on the eastern boundary of the security zone. As they broke out of the encirclement to the north, the rest of the reconnaissance battalion drove south from Bijeljina and stopped the Partisan advance at heavy cost. Rushing towards Janja from the east, III/27 came into contact with Partisans around Modran, reaching the Janja garrison at 10 pm that night and received artillery reinforcement by 3/AR 13 during the night. At dawn the following day, an additional four Partisan brigades attacked the garrison in Janja, with fighting continuing throughout the day before the Partisans withdrew to the south.  were sent after the fleeing enemy but were not able to inflict significant losses on them as they had already crossed the Drina into the German-occupied territory of Serbia. Following this battle, Army Group F concluded that the division's overall combat value was minimal.