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.
Q: Context : William Sooy Smith (July 22, 1830 -- March 4, 1916) was a West Point graduate and career United States Army officer who rose through the ranks to become a major general in the Union Army during the American Civil War.
Answer : American Civil War
A:
What was the war that William Sooy Smith fought in?