 According to Stanley Payne, Franco was offered this position as Mola's planning for the coup had become increasingly complex and it did not look like it would be as swift as he hoped, instead likely turning into a miniature civil war that would last several weeks.Mola thus had concluded that the troops in Spain were insufficient for the task and that it would be necessary to use elite units from North Africa, something which Franco had always believed would be necessary.On 12 July 1936, Falangists in Madrid killed police officer Lieutenant José Castillo of the Guardia de Asalto (Assault Guard).