In the spring of that same year, the Nationalist troops conquered the northern part of the country that was still Republican and also isolated: Basque Country, Cantabria and Asturias. The famous bombing of Guernica took place during this campaign, when a German air group sent by Hitler bombed a city that posed no military interest in the Spanish Civil War theatre and devastated it. It inspired Pablo Picasso's most famous painting: Guernica. During the Basque campaign general Mola died in a plane accident.