In 1968, the Soviet Union and four other member states of the Warsaw Pact, building on the doctrine of “limited sovereignty”, invaded Czechoslovakia in gross violation of the principle of non-interference in internal affairs (Article 2(7), Chapter I of the United Nations Charter). Bypassing the Parliament, the Hungarian party and the government decided to take part. The designated troops were basically the forces of the 8th Motor Rifle Division. The Hungarian military units were ordered on July 27, 1968, at 3 o'clock in the morning, to be fully operational and to carry out the mobilization of the reservists. The troops occupied Aszód and Rétság on 28 July, and their prepared waiting areas in the area between, and were prepared to carry out the task here. Out of the mobilised Hungarian personnel, four were killed in accidents.