Premise: When the famous unifiers Nobunaga, Hideyoshi, and Tokugawa fought to end the 16th-century civil wars, Hideyoshi used Himeji as a base of operations against the recalcitrant warlords of Western Honshu.

Hypothesis: When Hideyoshi was attempting to unify Japan, he used Himeji as a base.
Relation: entailment