This article examines the well-known myth of Hungarian military intervention in the Romanian revolutionary events in 1989. The topic of the military intervention danger is treated using the Romanian and Hungarian historiographic and archival sources. Based on these, it turned out that in the shadow of the Ceausescu's anachronistic decisions, political, military and professional interested groups used the disinformation strategy to conceal their real activities. Although the political anachronism promoted by Ceausescu disappeared in December 1989, following the violent events, those political, military and intelligence actors who have composed and conducted the bloody historical score of Romania in 1989 have not disappeared. One of the misinformations suggested by them (and still repeated) was the intervention launched by the Hungarian armed forces in the events in Romania.