Like other commanders and senior officers, Colonel Casado thought there might be a chance of professional army officers obtaining better terms for surrender than a regime controlled by Negrín and the communists. He was not one of those who hoped to save their lives, and perhaps also their professional careers, through a last-minute betrayal. But he was naive to believe that their military links and a record of anticommunism would sway Franco. The last thing that Franco wanted was for anyone else to be in a position of claiming that they had saved Spain from communism.
At the instigation of his brother César, a lieutenant-colonel of cavalry, Casado agreed to enter into contact with nationalist agents of the Servicio de Información y Policía Militar (SIPM). It is not known exactly when these first steps were made, but on 1 February Casado contacted Franco Ricardo Bertoloty and Diego Medina.18
After telling them that it was necessary to fix the conditions for the surrender of the Army of the Centre, he sent a message to General Franco asking for assurance that the men with whom he was talking were authentic nationalist emissaries. He was prepared to accept as confirmation a letter from his contemporary at military college, General Barrón.The same day Casado met Generals Miaja, Menéndez and Matallana in Valencia. They agreed with his plans. On the following day, back in Madrid, he went to see Besteiro at his home and they agreed to set up an alternative junta to the government. A few days later Eduardo Val offered the support of the anarchists in Madrid in accordance with what had been agreed at the meeting in Paris.19
Casado also stayed in touch with the various British agents, such as Denis Cowan, the representative of Sir Philip Chetwode, president of the international commission who supervised the exchange of prisoners. Cowan met Besteiro on 16 February and Casado four days later. Casado also met Stevenson, the British chargé d’affaires, who offered British mediation to prevent reprisals if Casado surrendered the central zone or help in evacuating republicans, if it came to that.On 5 February Casado was approached by Lieutenant-Colonel José Centaño, who informed him that he had been the head of ‘Green Star’, a secret nationalist organization in Madrid, since the beginning of 1938. Casado asked him to obtain from Burgos Franco’s conditions for surrender and the letter which he had requested from Barrón. Franco himself dictated to Barrón the terms and these were sent to Casado in Madrid on 15 February via agents of the SIPM.
Franco’s conditions were those of a conqueror. The republicans had lost the war and all resistance was criminal. Nationalist Spain demanded unconditional surrender, offering a pardon for those who had been ‘tricked into fighting’. Those who laid down their arms would be spared and judged according to the support they might give in the future to the ‘cause of nationalist Spain’. Safe conducts would be given to leave Spanish territory. After vague promises of humanitarian treatment, the letter finished with a clear threat: ‘Delay in surrender and a criminal and futile resistance to our advance will carry a grave responsibility, which we will exact on the grounds of the blood spilled uselessly.’20
Negrín, of course, was extremely suspicious, but he did nothing to forestall the coup, probably because he was exhausted and it would clear him of responsibility for the final collapse.21
Whatever the case, on 2 March Negrín ordered Casado and Matallana to come to see him at Elda. There he told them that he was preparing to reorganize army commands. Both Casado and Matallana outlined their objections and left. They went straight to Valencia to warn Menéndez and planned to bring forward their coup.The next day, 3 March, Negrín published in the