 Complete the following phrase:  In 1648, Hetman Bohdan Khmelnytsky introduced a new system of territorial-administrative division in Ukraine, having divided the country into regiments. Under this system the city of Pryluky became the military center of the Pryluky Regiment and Colonel Ivan Shkurat-Melnychenko was appointed its first commander. The regiment comprised about 2,000 Cossacks, who actively participated in many battles during the war of 16481654. For instance, the entire Pryluky Regiment of Cossacks, led by I. Shkurat, died fighting valiantly in the 