 Units from Navarre, Old Castile, Leon and Galicia formed part of troops attempting to cross Sierra de Guadarrama and reach Madrid, but failed.During first weeks of the war the requeté volunteers formed some 15-20% of all Nationalist troops on the peninsula and proved vital for some of their initial strategic achievements, namely cutting off the Northern enclave from France and forming a bulwark which separated the Republican-held Vascongadas and Aragon.Over time Requeté was losing importance as proportional component of the rebel troops.