 Complete the following phrase:  From 1611 to 1721, Sweden was a European great power, becoming a domit faction in the quest for control of the Baltic Sea and a formidable military power. During this period, known as Stormaktstiden , the Swedish Empire held a territory more than twice the size of its modern borders and one of the most successful military forces at the time, proving itself on numerous occasions on battlefields such as Wallhof, Narva and 