 Complete the following phrase:  Under Charles XII of Sweden, the son of Charles XI of Sweden, the regiment played a central role in the Swedish victories in the Great Northern War. One example is the Battle of Kliszów when the Swedish army of 12,000 men defeated the Polish-Saxon army double its size. In the battle, the right wing, built around the regiment, which had 21 squadrons and 2,100 men and was led by Carl Gustav Rehnskiöld, was surrounded on three sides by the Saxon cavalry of 34 squadrons with 4,250 men. The back line recognized the situation, quickly reverted and switched to attack the flanks of the enemy in a brutal battle which they eventually won. Other battles in the Great Northern War where the regiment played central roles include Crossing of the Düna, Battle of Pułtusk 1703, 