The Battery of Castillitos, also known as C-1, is a Spanish coastal artillery support fortification located on Cape Tiñoso, within the municipality of Cartagena, and more specifically in the Perín county.

The battery was built and armed between 1933 and 1936 according to how it was projected in 1926, during the program to provide a defensive belt to the strategic Cartagena square by the Primo de Rivera dictatorship.

Castillitos was equipped with two shore guns from the British company Vickers-Armstrong, of the 38.1 / 45 cm (fifteen inch) model. These pieces were powerful enough to fire a nearly one-ton projectile at 35 kilometers.

Its task was to protect the entrance to the bay of Cartagena along with its twin, the Battery of Ashes located at Cape Negrete, in a crossfire that prevented the entry of hostile elements.

During the Spanish Civil War he launched a discharge against the fleet of the rebel side in April 1937, although the presence of the fortifications that surrounded the city was enough to intimidate the rebel ships.

After the war ended, in 1942 a new direction of fire was added and it was studied to support it with strategically placed rangefinders and graphometers, although it was finally abandoned.

It remained in service until 1994, when the NORTE Plan was applied, which sought to make better use of the resources of the Armed Forces.