Q: Generate a question which can yield the answer mentioned in the input. Generated question must be answered by the answer provided in input, without using any extra knowledge.
Context : Philip St. George Cooke (June 13, 1809 -- March 20, 1895) was a career United States Army cavalry officer who served as a Union General in the American Civil War.
Answer : American Civil War
A:
In what war was Philip St. George Cooke in?