A recently discovered Vietnamese military report says that the Vietminh staged psychological warfare against South Korean soldiers during the Vietnam War with help from North Korea.

The document explains that the Vietminh, the Vietnamese revolutionary organization founded by Ho Chi Minh in 1941, formed a psychological warfare unit in 1967 to create confusion among South Korean soldiers.

The document states that special agents dispatched by the North’s Workers’ Party played a key role in operating the unit.

The report said the North Korean agents produced propaganda broadcasts and publications in Korean. The Vietminh assessed in the report that the North Korean agents' efforts had yielded strong results.

The recent document was discovered by the Washington-based Woodrow Wilson International Center for Scholars and by Merle Pribbenow, a retired Central Intelligence Agency officer and expert on Vietnam.