Attached to the 11th Division of Enrique Líster,[2] the 70th MB took part in the fighting that developed around Pingarrón, between February 19 and 22; the unit lost half of its troops during these days, without being able to conquer the disputed position.

The 70th MB carried out the main attack on Brihuega, a town it took on March 18; this action put an end to the offensive of the Corpo Truppe Volontarie.

On July 22, it carried out an attack from Villanueva de la Cañada to reach the first houses of Brunete, but suffered a high number of casualties.

On the morning of March 6, the unit's forces occupied various points in Madrid, among others the Alameda de Osuna, the Ministry of Finance and the Telefónica building.

[5] After the triumph of the coup, most of the rebel forces returned to their original positions, although the 70th Mixed Brigade remained in Madrid for if an anti-Casado revolt occurred again.