Generate a correct and concise answer for the question based on the words in the context.

[EX Q]: Context : The film was adapted by Wilder and Edwin Blum from the Broadway play by Donald Bevan and Edmund Trzcinski which was based on their experiences as prisoners in Stalag 17B in Austria.
Question : The Stalag 17 is based upon what?
[EX A]: Donald Bevan

[EX Q]: Context : Karl Gustav von Sandrart (1817-1898) was a Prussian general in the Franco-Prussian War of 1870.
Question : In what war did Karl Gustav von Sandrart fight?
[EX A]: Franco-Prussian War

[EX Q]: Context : Gustav Wachtmeister (25 July 1757 -- 20 July 1826) was a Swedish Army officer made famous at the Battle of Valkeala in Finland in 1789 against Russia where he was wounded by a musket shot to his arm, which had to be amputated.
Question : In what war was Gustav Wachtmeister in?
[EX A]:
Battle of Valkeala