These barrels were buried in a burial mound near the "Great Buddha" of Hideyoshi, where they remain today under the wrong name of mimizuka or "ear mound." Military formations During the Azuchi-Momoyama period and thanks to the introduction of firearms, combat tactics changed dramatically. The military formations adopted had poetic names, among which are: Martial arts Each child who grew up in a samurai family was expected to be a warrior when he grew up, so much of his childhood was spent practicing different martial arts. A complete samurai should be skilled at least in the use of the sword (kenjutsu), the bow and arrow (kyujutsu), the spear (sojutsu, yarijutsu), the halberd (naginatajutsu) and subsequently the use of firearms (houjutsu). Similarly, they were instructed in the use of these weapons while riding a horse. They were also expected to know how to swim and dive. originates from the Sengoku period in the 15th century. The samurai developed which was useful in case they were thrown overboard during naval conflicts. The samurai practiced , and to board enemy vessels. Activities included strokes with swords, bows and firearms. Hands were kept dry above the water to write messages with an ink brush on a paper scroll. This skill was useful for muskets which require dry gunpowder. Nihon Eiho is practiced by 28 schools and recognized by the Japan Swimming Federation. During the feudal era of Japan, various types of martial arts flourished, known in Japanese under the name of bujutsu (武術). The term jutsu can be translated as "method", "art" or "technique" and the name that each one has is indicative of the mode or weapon with which they are executed. The combat methods that were developed and perfected are very diverse, among which are: Today martial arts are classified in koryū budō or classical martial arts, before the 19th century, and to the modernization of Japan. Modern traditional martial arts are called gendai budō. Myth and reality Most samurai were bound by a code of honor and were expected to set an example for those below them. A notable part of their code is or hara kiri, which allowed a disgraced samurai to regain his honor by passing into death, where samurai were still beholden to social rules. While there are many romanticized characterizations of samurai behavior such as the writing of Bushido: The Soul of Japan in 1899, studies of