Until its demise it operated mostly in the Sierra Morena area, at the southern limits of the territory held by the Republic.

[2] A unit known as Brigada Móvil de Puertollano was established towards the end of 1936 led by Infantry Lieutenant Colonel Ernesto Martín del Castillo.

Between 27 March and 13 April it took part in military operations over Peñarroya-Pueblonuevo, attacking Pozoblanco in the left flank of the campaign.

[2] However, in order to satisfy the demands of the Non-Intervention Committee, the foreign members of the brigade were withdrawn on 1 October 1938 and were replaced by battalions of Spanish conscripts.

[1] The unit saw little action in the intervening months until the final defeat and surrender of the Spanish Republic in March 1939.