What happened in 1981 in Poland?

On December 13, 1981 the Military Council of National Salvation, which is headed by General Wojciech JaruzelskiWojciech JaruzelskiWojciech Witold Jaruzelski (Polish: [ˈvɔjt͡ɕɛɣ ˈvitɔlt jaruˈzɛlskʲi] ( listen); 6 July 1923 – 25 May 2014) was a Polish military officer, politician and de facto leader of the Polish People's Republic from 1981 until 1989.https://en.wikipedia.org › wiki › Wojciech_JaruzelskiWojciech Jaruzelski – Wikipedia, imposed martial law in Poland. On this day, the hopes of millions of Poles were crushed, while the chance of introducing democratic changes was lost for many years.