fˈɑːloʊɪŋ ðə dʒˈɔɪnt dʒˈɜːmənsˈoʊviət ɪnvˈeɪʒən ʌv pˈoʊlənd, wˌɪtʃ stˈɑːɹɾᵻd wˈɜːld wˈɔːɹ ɹˌoʊmən tˈuː ɪn sɛptˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi nˈaɪn, ɪt wʌz ˈɑːkjʊpˌaɪd baɪ nˈɑːtsi dʒˈɜːməni.
Following the joint German-Soviet invasion of Poland, which started World War II in September 1939, it was occupied by Nazi Germany.