The Delaunays travelled to Spain in 1914, staying with friends in Madrid. At the outbreak of the First World War in 1914 Sonia and Robert were staying in Hondarribia, in the Basque Country, with their son still in Madrid. They decided not to return to France. In August 1915 they moved to Portugal where they shared a home with Samuel Halpert and Eduardo Viana. They discussed an artistic partnership with Viana and their friends Amadeo de Souza-Cardoso, whom the Delaunays had already met in Paris, and José de Almada Negreiros. In Portugal she painted "Marché au Minho" ("Market in Minho", 1916), which she later says was "inspired by the beauty of the country". Sonia had a solo exhibition in Stockholm (1916).