From the beginning of Spanish Civil War in the province of Granada, the rebel troops undertake a stablishment of a defensive perimeter around the capital, especially over principal roads.Alfaguara's Subsector was related with the closing of perimeter between Jaén and Murcia's roads, taking control over secondary accesses.As stabilized front, it prolonged the construction and improvement of defensive positions during the three years of war.This provoked the appearance of a wide catalogue of fortification works and the evolution of a structural system.This research deals with the study of these fortifications from an archaeological methodology.