Part of Season 2014 of this show: https://www.tvmaze.com/shows/93110/zdfzeit

On 1 September 1939, Hitler started the most fatal war in world history – a war waged to plunder, dispossess, enslave and eliminate entire ethnic groups. This German-Polish series reconstructs how Hitler triggered a chain of events that sparked a global conflagration and the intense suffering of the Polish people, the first victims of the war.