 However, they were challenged by the arrival of more Italian and Spanish nationalist aircraft and a large scale dogfight was fought over Arganda, and they suffered heavy losses from German 88 mm guns while undertaking ground attack missions.The Nationalists brought their reserves forward and on February 12 opened a powerful attack in the direction of Morata.Asensio's troops took the Pingarrón hills and assaulted the Pajares heights to the north.