Precursors to naval mines were first invented by Han Chinese innovators of Imperial China .
Precursors to naval mines were first were described in thorough detail by the early Ming dynasty artillery officer Jiao Yu , in his 14th century military treatise known as the Huolongjing .
Precursors to naval mines were first invented by Han Chinese innovators of Imperial China and were described in thorough detail by the early Ming dynasty artillery officer Jiao Yu , in his 14th century military treatise known as the Huolongjing .