In July 1936 during the early days of the Spanish Civil War, ABC falsely reported that Zamora had been killed by Republicans. The Nationalists then attempted to exploit this as propaganda. However, Zamora was alive and well and, as rumours began to spread of his death, he was arrested by Republican militia and then imprisoned at the Modelo prison. Among his fellow prisoners were Ramón Serrano Súñer and Rafael Sánchez Mazas. His life was saved by both the actions of the prison governor Melchor Rodríguez García and because of his own willingness to play and talk football with the guards. Zamora was eventually released after the Argentinian Embassy interceded on his behalf. He then made his way to France where he was reunited with Josep Samitier at OGC Nice. He later returned to Spain and on 8 December 1938 played for a Spain XI against Real Sociedad in a benefit game for Nationalist soldiers.
