Detailed Instructions: 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 : Alexander Kelly (April 7, 1840 -- June 19, 1907) was a Union Army soldier during the American Civil War and a recipient of America's highest military decoration--the Medal of Honor--for his actions at the Battle of Chaffin's Farm.
Answer : American Civil War
A:
In what war was Alexander Kelly a combatant?