The Puerta de la Cadena in Brihuega, Guadalajara, stands as one of five historic gates once securing the town's walls, notable for its semicircular arch with battlements. This northern gateway commemorates the fierce assault of 1710 during the War of Spanish Succession through inscribed plaques marking the Battle of Brihuega-Villaviciosa. Above these historical markers, a sculptural niche honors the Immaculate Conception, symbolizing the spiritual dimension of the town's defense. Known in older documents as the Puerta de Valdeatienza for the road to Atienza it controlled, the gate represents both medieval military engineering and the region's turbulent early modern history.