 During the Spanish Civil War in 1936 he was a correspondent in Madrid and supported the Spanish Republican Army, staying at the famous Hotel Florida (Madrid), then also inhabited by the likes of Ernest Hemingway.He wrote about Spain in the book "W czerwonej Hiszpanii" (In the Red Spain), published in 1937 (translated to Spanish as "En la España roja" in 2007).Before September 1939 he reported from Gdańsk.