 Communist leaders met in Hanoi in March for a series of meetings to plan for a massive offensive against the South.In June 1973, the U.S. Congress passed the Case–Church Amendment, which prohibited any further U.S. military involvement, and the PAVN supply routes could operate normally without any fear of U.S. bombing.The standard view of this period is that after Ho Chi Minh's death in September 1969, Giáp lost a power struggle in 1972 shortly after the failed Easter Offensive where he was blamed by the Politburo for the offensive's failure.