Białystok during World War II – time between the first and second Soviet
During Second World War on 15 September 1939 Nazi forces entered Białystok. Since the German invasion of Poland on 1 September 1939 Białystok was a major hub for refugees from central Poland. They were mostly Jewish citizens running from Nazi occupation. Even after the war efforts ceased, refugees kept coming, illegally passing Nazi-Soviet demarcation line on Bug river. Due to those actions, Białystok population had doubled or even tripled.