1, which was first seen in ancient China, such as "Bao De" by Xie Tiao in Nanqi: "Only Fang Chang, who has traveled for many years and is really prosperous and blessed with martial arts, saw the wind go against him, and the Dragon Tower was wide open, and the Emperor Liang regained it." Later, Japan quoted a lot, referring to the fate of samurai.
2. During the Warring States Period in Japan, Warring States warriors believed that everyone had martial arts, and the difference of martial arts decided life and death on the battlefield. If you survive, it means that your martial arts are still there. If you die, it means that your martial arts are not good or have been exhausted. Japanese samurai often use a sentence when evaluating their respected enemies, but unfortunately their martial arts are not good. )
When the samurai goes out to war, his relatives can't show reluctance, because it may distract the samurai and lose their lives on the battlefield. Therefore, when he was sent to the battlefield, his relatives would say, "I wish you long military luck." Later, this sentence gradually became a kind of etiquette and has been preserved. Even if the samurai class was completely abolished after the Southwest War, this sentence is still associated with Japanese soldiers.