Spanish Road
The reopening of the Spanish Road enabled Spain to maintain its war in the Low Countries for another twenty years, and also had a crucial impact effect on the course of the Thirty Years War, as it enabled the Spanish to rush troops to Germany in the mid-1630s and thereby arrest the seemingly inexorable string of Swedish victories in the first part of that decade (notably by the First Battle of Nördlingen; the Spanish army which won this victory had reached Germany by marching up the Spanish Road).