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 : Lewis Locke (born Louis Tacy) (November 5, 1835 - January 4, 1920) was a Private in the Union Army and a Medal of Honor recipient for his actions in the American Civil War.
Answer : American Civil War
A:
In what war was Lewis Locke a combatant?