of the town. Initial stage During the first days of battle, there was a rapid mobilization of the workers who managed to reduce the coup plotters in Asturias: Faced with the appearance that the coup had already passed, more than 2,000 Asturian militiamen immediately left towards León and Ponferrada, but Aranda, colonel of Oviedo, took advantage of that moment to rebel and launch their forces into the street. As a result, the city of Oviedo became surrounded by Aranda and his army inside. Consequently, the Republican attempt to conquer León was postponed, and in a matter of weeks, the battlefront became stabilized parallel to the Cantabrian mountain range that included the Port of Tarna. This line provided geographical advantages: Port of Leitariegos Vega de los Viejos San Pedro de Luna Magdalena area La Robla Tarna The Pontoon Soon the republican forces militarily controlled the area of the Case Council including Tarna. Villa Lucila transitioned into a field hospital and command headquarters. Throughout 1936, this front line maintained regular battles but remained stable, since both sides were living in the Asturian West. Francoist troops advanced from Galicia with the intention of reaching Oviedo. Republican forces were absorbed by the task of containing this attack from the west, and at the same time, tried to defeat Aranda to take Oviedo before the enemy arrived from the west. They enacted several attempts to recover Oviedo. The strongest attack took place on October 8, 1936, which encircled the town itself: fighting street by street, but they failed to take control of the city. Finally, the Francoists managed to establish a "corridor" through Grado and conquer Oviedo on the 17th. The Republicans tried to cut this "corridor" on several occasions, with 50,000 men, which included their aviation and a large part of their artillery. The struggle through the "Corridor of Grado", stopped and resumed three times, consuming enormous efforts on both sides. Meanwhile, the Tarna area maintained a "containment" role since there was a balance of forces. The most strategic points were fortified. Even today, concrete structures like the Fort of Alboleya, the Fort of Guaranga, and the two forts that remain in the Port of Tarna exist. These structures resemble a small part of the military deployment of the time, which was characterized by large areas protected by trenches, observation points, barbed wire, and a “no-man's-land” space between the two armies. Each republican battalion