Both the Yugoslav Partisans and the Chetnik movement initially resisted the occupation. However, after 1941, the Chetniks adopted a "policy of collaboration." They collaborated extensively and systematically with the Italian occupation forces until the Italian capitulation, and thereon also with German and Ustaše forces. The Axis mounted a series of offensives intended to destroy the Partisans, coming close to doing so in winter and spring of 1943. Despite the setbacks, the Partisans remained a credible fighting force, gaining recognition from the Western Allies and laying the foundations for the post-war Yugoslav state. With support in logistics, equipment, training, and air power from the Western Allies, and Soviet ground troops in the Belgrade Offensive, the Partisans eventually gained