After liberating French North Africa and clearing the enemy from the Italian colonies, the Allies sought to bring the entire French empire effectively into the war against the Axis powers. They reopened the Mediterranean route to the Middle East. They went on from Africa to liberate Sicily, Sardinia, and Corsica. They caused Mussolini to topple from power, and they brought his successors to surrender. They drew more and more German military resources into a stubborn defence of the Italian peninsula, and helped the Yugoslavs to pin down within their spirited country thousands of Axis troops. Eventually, the Allies delivered a solid blow from southern France against the German forces which were opposing the Allied drive from the beaches of Normandy! They made Marseilles available for Allied use and they occupied northern Italy and Greece." Howe further notes that "Hitler had always accepted the principle that the Mediterranean was an area of paramount Italian interest just as, farther north, German interests were exclusive.