In early September 1620 the Royal Grand and Field Hetman's Zolkiewski and his protegee, future hetman Stanisław Koniecpolski, assembled 8,000 men and marched south. However, Graziani's contribution comprised just 600 men. At the Battle of Cecora (18 September to 6 October 1620), on the river Prut, Zolkiewski met the 22,000 strong army of Iskender Pasha, withstanding repeated attacks during September 1620. On September 29 he ordered a retreat, and for eight difficult days discipline held despite enemy attacks. On approaching the Polish border, order in much of the army melted and the forces disintegrated on the spot. The Ottomans attacked and much of the Commonwealth army was destroyed. Zolkiewski was killed, his head sent to the Sultan as a trophy, while Koniecpolski was captured.