The GERC was under the command of general José Miaja Menant, the Defence of Madrid hero.

In December 1938 the GERC was scheduled to take part in General Vicente Rojo Lluch's "Plan P", an ambitious project of an offensive campaign in Extremadura that would have taken place at the same time as a disembarkment within the enemy lines in Motril, along with diversionary attacks in other places of Andalusia and the Madrid Front.

However, in the face of the opposition of General Miaja and other Republican commanders to the implementation of the whole plan, it was not carried out to its full extent and the only action taken was the Battle of Valsequillo which resulted in failure shortly before having been initiated.

[4] Following the fall of Catalonia in February, on 2 March 1939 President Juan Negrín arranged for a reorganization of the Republican Armed Forces in the Central Zone, decreeing the disbandment of the GERC, as well as a reorganization of the command structure.

[5] However, Segismundo Casado's coup that took place a few days later would hinder the implementation of these eleventh-hour measures.