Operation Summer '95 started at 0500 on 25 July. The HV 7th Guards Brigade advanced north-west along the LivnoBosansko Grahovo road towards the town of Bosansko Grahovothe offensive's main objective. A composite company drawn from the HV 114th Infantry Brigade attacked VRS positions on the right flank of the advance. The 7th Guards Brigade managed to move forward by about , but had to suspend its effort as the 114th Brigade company could not defeat the VRS' entrenched defences at Marino Brdo to cover the 7th Brigade's right flank. The VRS defences were well prepared all along the front line attacked by the HV and the HVO. The Bosansko Grahovo zone was particularly well prepared for defencefortifications, shelters and covered trenches were built to establish defence in depth, with obstacles, including minefields, in between them.