 Several JNA posts were attacked by the ZNG before the blockade was officially sanctioned, largely in response to local battlefield situations.The first such incident was a failed attack on JNA barracks in Sinj on 25 August, in response to the deterioration of ZNG positions in the nearby village of Kijevo.On 3 September, the ZNG captured a barracks in Sisak, and on 13 September a weapons storage depot in Gospić area was captured amid fighting for control of the city.