Sengoku jieitai (1979) on Netflix

A squadron of Japanese Self-Defense Force soldiers find themselves transported through time to their country's warring states era, when rival samurai clans were battling to become the supreme Shogun. The squad leader, Lt. Iba, sees this as the perfect opportunity to realize his dream of becoming the ruler of Japan. To achieve this, he teams his troops up with those of Kagatori, a samurai daimyo who also aspires to become Shogun. Are either of these power-hungry warriors to be trusted?