Soon to Cossacks were sent deputies (e.g. Czarnecki, hostage-Cossack was Kryvonis). Khmelnitsky put up tough requirements: give to the Cossacks the Polish cannons, banners, and Commissioner Szemberg. The Poles agreed on everything except to give up Szemberg. Finally, an agreement was made. In return for the cannons, the Poles would receive safe passage. However, after giving up the cannons, Khmelnytsky broke the agreement, imprisoned the deputies imprisoned, and Colonel Kryvonis escaped. The next day there was an attempt to break out of the encirclement, Poles along with tabor began to walk towards the small fortified town Kryliv. They were, however, stopped at the cost of hundreds of soldiers captured by the Tatars. The Cossacks launched an assault but were repulsed. This was followed by another assault, the fighting continued until the evening and the Cossacks were repulsed again. Poles again decided to break through to Kryliv. May 16, after 1:00 a.m.