My niece asked me why Toyota Hideyoshi and Oda Nobuyuki didn't know about Bray. How to answer easily?

Because the Japanese couldn't use mines at that time.

/kloc-At the beginning of the 3rd century, China used an explosive weapon-Thunderbolt (also called Tiehuo _). This weapon can be buried in a narrow road, and when the enemy approaches, it will be detonated with a slow-burning fire rope to kill the enemy. This is the embryonic form of early mines. By the early Ming Dynasty, there were documents about the use of mines. Jiao Yu wrote the Firearms Monograph "Dragon Artifact Array" in the 10th year of Yongle (14 12), which recorded the production methods of mines such as mine explosion camps, homemade guns, rock blasting guns and invincible mine guns. With the invention of various high explosives and detonators, mines are developing in the direction of standardization and diversification.