During the invasion of Poland by Germany in 1939, Korczak fled to Lituania and met Vitka Kempner in VilnIUS thanks to HaShomer HaTzair.[3] Upon Germany's invasion of the Soviet Union, she co-founded the Fareynikte Partizaner Organizatsye (FPO) with Abba Kovner and Kempner in 1942.[4] They smuggled weapons into the Vilna Ghetto and smuggled Jews out.[3]
As the situation worsened in the ghetto, she left it in September 1943 with the last group of fighters passing through the sewers and took refuge in the forests of Rūdninkai and Naroch.[4] After the Red Army occupied Vilnius in July 1944, she and her companions focused on helping Jewish refugees and their emigration to Palestine. She arrived there on December 12, 1944.[3][5]
