After years of the civil conflict in China since the fall of the Imperial system in 1911 the victory of the Nationalists in 1928 should have heralded a period of peace. Instead the next nine years were to see wars, revolts and revolutions that took the lives of millions of soldiers and civilians. Although officially at peace, the country was torn apart by foreign invasion, civil war and class conflict that often went unreported. Full-scale war with the Soviet Union and Japan cost China territory and prestige while civil conflict tore Chinese society apart. Clandestine warfare was waged by Japan during the 1920s, which led to an invasion and occupation of Manchuria in 1931. The Nationalist Government waged war on several fronts, fighting the invading Japanese while being obsessed with defeating the Chinese Communists. There were an astounding number of conflicts during this period involving China and many are little known, even to some students of Chinese military history.