The Eisenhower administration placed a high priority on undermining Soviet influence on Eastern Europe, and escalated a propaganda war under the leadership of Charles Douglas Jackson. The United States dropped over 300,000 propaganda leaflets in Eastern Europe between 1951 and 1956, and Radio Free Europe sent broadcasts throughout the region. A 1953 uprising in East Germany briefly stoked the administration's hopes of a decline in Soviet influence, but the USSR quickly crushed the insurrection. In 1956, a major uprising broke out in Hungary. After Hungarian leader Imre Nagy promised the establishment of a multiparty democracy and withdrawal from the Warsaw Pact, Soviet leader Nikita Khrushchev dispatched 60,000 soldiers into Hungary to crush the rebellion. The United States strongly condemned the military response but did not take direct action, disappointing many Hungarian revolutionaries. After the revolution, the United States shifted from encouraging revolt to seeking cultural and economic ties as a means of undermining Communist regimes. Among the administration's cultural diplomacy initiatives were continuous goodwill tours by the 'soldier-musician ambassadors' of the Seventh Army Symphony Orchestra.