These early successes seemed to give Hitler confidence. In 1936 a civil war broke out in Spain between Communists, who were supporters of the Republican government, and right-wing rebels under General Franco. Hitler saw this as an opportunity to fight against Communism and at the same time to try out his new armed forces.
In 1937, as the League of Nations looked on helplessly, German aircraft made devastating bombing raids on civilian populations in various Spanish cities. The destruction at Guernica was terrible. The world looked on in horror at the suffering that modern weapons could cause.