The 'Lion of the North', King Gustavus Adolphus of Sweden, was one of the major players in the Thirty Years War of 1618-48. In 1630 Gustavus - the last champion of the Protestants - crushed the Catholics at Breitenfeld in a victory widely viewed as the fulfillment of a prophecy foretelling the defeat of the eagle (the German Emperor's emblem) by a golden lion. Killed in battle at Lutzen only two years later, Gustavus nevertheless won fame for his technical and tactical innovations. The first of two volumes, this book examines the equipment, uniforms and organization of the infantry that comprised Gustavus's army.