The biography of Oda Nobunaga

Okehazama (1560)

The following year, 1560, Imagawa Yoshimoto decided to make a decisive move to the west. His aim was to drive along the Tokaido coast, brushing aside the Oda and any who did not submit to the Imagawa army with the ultimate goal of occupying Kyoto. To this end Yoshimoto gathered perhaps 20,000 to 25,000 men from Suruga, Totomi, and Mikawa in June, leaving his son Ujizane to run things while he was off conquering. He included Matsudaira Motoyasu in the invasion force, and dispatched the Mikawa samurai to reduce the fort of Marume. Meanwhile, the rest of the Imagawa host crossed in Owari and assaulted Washizu Castle. The commanders of the besieged forts (Sakuma Môrishige and Oda Genba) managed to get off letters of warning to Nobunaga in Kiyosu, and his retainers were divided on what course of action to take. Given the obvious disparity in numbers, it seemed logical to adopt a defensive posture, or even to capitulate. Nobunaga was for fighting. With all the brash and unpredictable élan he was to show throughout his career, he ordered a conch shell blown and the garrison of Kiyosu made ready for battle.

The next morning, while Marume and Washizu were going up in flames, Nobunaga led a handful of men out of the castle and headed in the direction of Imagawa's army. Along the way he was joined by enough ashigaru and samurai to make an attack credible-if not particularly wise. At ten to one odds, Nobunaga's chances seemed slim at best, although the priests at the Atsuta Shrine that he stopped at to pray for victory commented on how calm he appeared.

Meanwhile, Imagawa was celebrating the course of his campaign so far. Encamped in the Dengakuhazama gorge, Imagawa's army rested and enjoyed sake, their leader engrossed in the viewing of the heads taken at Marume and Washizu. Nobunaga, paused near the Imagawa's Narumi Fort, learned of the Imagawa's location from scouts, and played a stratagem. He had battle flags hoisted up from behind a hill, presenting the image to the Imagawa stationed inside Narumi that the Oda were resting nearby. In fact, Nobunaga slipped his men quietly away, leading them in the direction of the Dengakuhazama. At this critical point, a bit of good luck went Nobunaga's way. A summer thunderstorm broiled over and let loose with a torrential downpour, enabling Nobunaga to sneak up quite close to the Imagawa's position. When the rains abated, he gave the order to attack.

Such was the suddenness and ferocity of the attack; Imagawa assumed that a fight had broken out among his own men. His misconception was quickly righted by the appearance of Oda spearmen who succeded in taking the head of the lord of Suruga. Nobunaga's surprise attack worked beautifully, and once word spread of Yoshimoto's demise, the Imagawa army fled, utterly defeated. Matsudaira Motoyasu, resting his men in Marume, heard of the defeat and thought it best to return to Mikawa forthwith.

Nobunaga's stunning victory at Dengakuhazama (known to posterity by the name of nearby Okehazama village) changed the course of Japanese history. It had two immediate results. Firstly, it brought Oda Nobunaga national fame and removed a wolf from his back door. Secondly, it allowed Matsudaira Motoyasu to extricate himself from the Imagawa's clutches and establish Mikawa as an independent province. Both results were to have heady consequences in the years to come.