I am not sure that this is appropriate at MO, so if not, please, delete this.

This is inspired by [David Hansen's question][1] where he asks about mathematics done during the WWII. I would like to ask the opposite question: 

> what are some examples of mathematical research interrupted by the war?

Everyone is aware of the terrible damage inflicted by the war on the Polish mathematical school. The dramatic destinies of [Stefan Banach][2] (who lived in very difficult conditions during the WWII and died soon after it), [Juliusz Schauder][3] (killed in Gestapo), [Józef Marcinkiewicz][4] (killed in Katyn) and of many others have much influence on the conscience of mathematicians in Central Europe (including Russia, and I believe, not only here). 

When I was a student an idea was popular in Soviet Union that war moves science. I must confess, I am a partisan of the opposite one: war kills science. I would be grateful to people here who would share their knowledge and give illustrations  (I mean here any war, not necessarily WWII).


  [1]: https://mathoverflow.net/questions/36094/notable-mathematics-during-world-war-ii
  [2]: https://en.wikipedia.org/wiki/Stefan_Banach
  [3]: https://en.wikipedia.org/wiki/Juliusz_Schauder
  [4]: https://en.wikipedia.org/wiki/J%C3%B3zef_Marcinkiewicz