Thirty-five years ago, on 17 September 1991, Croatian forces successfully liberated the military installation in Virovitica. This move marked a key turning point in the defence of that part of Croatia, as the liberation of the barracks resulted in the entire city becoming free of hostile forces.

Prior to the operation, the situation on the ground was tense. The barracks had been under blockade for the previous days, and on 16 September, immediately before the final action, the electricity and water supply were cut. Negotiations were held with the barracks' command regarding surrender, but these ended in failure, leading Croatian forces to launch a direct attack.

The liberation had strategic significance as Croatian forces took control of a large quantity of weaponry and equipment, including heavy artillery. The captured equipment, including ammunition, was used not only to equip the 127th Brigade but also the wider region, including the areas of Grubišno Polje and Bjelovar.

In addition to the military aspect, the liberation had a humanitarian dimension. Following the operation, members of the hostile forces were allowed to surrender and leave the area of Virovitica safely. This event, which took place on 17 September 1991, remains an important part of the history of the defence of Virovitica and its surrounding areas.