Lê Duẩn
At the 1957 May Day parade, Trường Chinh was still seated as the country's second most powerful figure. Lê Duẩn was gradually able to place his supporters, notably Lê Ðức Thọ, in top positions and outmaneuver his rivals. He visited Moscow in November 1957 and received approval for his war plans. In December 1957, Hồ told the 13th Plenary Session of a "dual revolution"; Trường Chinh became responsible for the socialist transformation of the north, while Lê Duẩn focused on planning the offensive in the south.