After graduating from the Military Academy, he fought on the eastern front in 1942-44. Following the Second World War, he was division chief of the general staff, then commander of the infantry. From 1950 he was the founding commander of the legal predecessor of the current Zrínyi Miklós National Defence University. In 1951 he was arrested and sentenced to death but released in 1956 and joined the government of Imre Nagy. During the revolution he fulfilled a number of important posts and was commander of the National Guard. After the suppression of the revolution, he emigrated to the United States, where he worked as military historian and military scientist. He is author of 20 books and several dozen scientific studies. Following the transition to democracy from 1990 he served as a general, from 1990 to 1994 he was a Member of Parliament. From 2004 he has been an associate member of the Hungarian Academy of Sciences.