sentences:  From 1956 to 1959 he was in charge of the Military Intelligence and Police division in the Warsaw Military District.In the course of his career he held a number of senior posts, including military attaché in China from 1959 to 1961, commander of an independent mechanized brigade in the Silesian Military District from 1961 to 1963, commanding officer of the 8th Motorised/Mechanized Infantry Division from 1963 to 1967, commander of the 2nd Polish Army from 1967 to 1972 (including during the Warsaw Pact invasion of Czechoslovakia in 1968), commander of the Silesian Military District from 1972 to 1973 and Chief of General Staff of the Polish Army from 1973 to 1983.Siwicki was a long-serving Minister of National Defense in the governments of Wojciech Jaruzelski, Zbigniew Messner, Mieczysław Rakowski and Tadeusz Mazowiecki (from 1983 to 1990 total).