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 a 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][5]) 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. 

P.S. By war I mean 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
  [5]: https://en.wikipedia.org/wiki/Katyn_massacre