During 26 and 27 June, the French reorganised, rebuilding their assault teams. It was decided that, before the ravelin in front of the gate could be stormed, first the hornwork and the Groene Halve Maan would have to be reduced to prevent enfilading fire. Gun batteries were placed between the lunette and the hornwork, to bombard it from a short distance. These gun emplacements also could interdict a possible sally from the gate. On 27 June, Louis was in a contemplative mood, silently observing for hours the bombardment of the city, standing on the north slope of the Sint Pietersberg. French engineers dug a tunnel under the hornwork and in the night of 27/28 June they a let a mine explode. The Italian defenders panicked and allowed the ramparts to be scaled. They then rallied, counterattacking with hand grenades, but ultimately were forced to leave possession of the earthwork to the French. The French captured several engineers who revealed the position of mined tunnels. Before the attackers could penetrate the tunnel network, the defenders blew five mines under the hornwork. Although the French readied themselves for a sally, none took place. The understrength garrison was now too weakened. On 28 June, a delegation of burghers requested de Fariaux to surrender. An additional gun battery was placed opposite the gate. In the night of 28/29 June French troops infiltrated to the ravelin which proved to have been abandoned.