In the meantime, the Cossack and Tatars would try to extend their fortifications closer to the defender's line; they launched their last large assault on 6 August, but were defeated once more. Soon afterward the Cossack and Tatar sent off a large chunk of their forces under Bohdan Khmelnytsky to intercept the nearing royal reinforcements under John II Casimir at Zboriv; the resulting battle ended in the Treaty of Zboriv of 17 August. In the meantime, at Zbarazh, the besiegers even managed to successfully dig a tunnel into the Polish-Lithuanian camp around 16 August, but it was destroyed by the defenders.
During this period, the Cossacks and Tatars attempted to fortify their positions near the defender's line; they launched a final major assault on August 6 but were unsuccessful. Following this, the Cossacks and Tatars dispatched a significant portion of their troops under Bohdan Khmelnytsky to intercept the approaching royal reinforcements led by John II Casimir at Zboriv, resulting in the Treaty of Zboriv on August 17. At Zbarazh, the besiegers successfully excavated a tunnel into the Polish-Lithuanian camp around August 16 but it was later destroyed by the defenders.