Given the task definition and input, reply with output. 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 : John Holland, 2nd Duke of Exeter KG (18 March 1395 -- 5 August 1447) was an English nobleman and military commander during the Hundred Years' War.
Answer : Hundred Years' War
Which historic war did John Holland, 2nd Duke of Exeter participate?