聯俄容共
In 1927, after the dissolution of the First United Front between the Nationalists and the Communists, the ruling KMT purged its leftist members and largely eliminated Soviet influence from its ranks. Chiang Kai-shek then turned to Germany, historically a great military power, for the reorganization and modernization of the National Revolutionary Army. The Weimar Republic sent advisers to China, but because of the restrictions imposed by the Treaty of Versailles they could not serve in military capacities. Chiang initially requested famous generals such as Ludendorff and von Mackensen as advisers; the Weimar Republic government turned him down, however, fearing that they were too famous, would invite the ire of the Allies and that it would result in the loss of national prestige for such renowned figures to work, essentially, as mercenaries.