Battle of Nagashino

The Battle of Nagashino took place in 1575 near Nagashino Castle on the plain of Shitaragahara in the Mikawa Province of Japan. Takeda Katsuyori attacked the castle when Okudaira Sadamasa rejoined the Tokugawa, and when his original plot with Oga Yashiro for taking Okazaki Castle, the capital of Mikawa, was discovered. The Oda arquebusiers, using tanegashima, decisively defeated the cavalry tactics of the Takeda, who lost two-thirds of their army. The battle is often cited as a turning point in Japanese warfare and the first "modern" Japanese battle. Takeda Katsuyori attacked the castle on 16 June, using Takeda gold miners to tunnel under the walls, rafts to ferry samurai across the rivers, and siege towers. On 22 June the siege became a blockade, complete with palisades and cables strewn across the river. Sadamasa's wife, Kamehime, was the daughter of Tokugawa Ieyasu. She helped to defend the castle by sending a letter with Torii Suneemon which asked her father for reinforcements. Torii reached Okazaki, where Ieyasu and Nobunaga promised help. Later, both Tokugawa Ieyasu and Oda Nobunaga sent troops to assist Sadamasa to break the siege and defeat Katsuyori. Returning that message back to the castle, Torii was captured and hung on a cross before the castle walls. However, he was still able to shout out that relief was on the way before he was killed. Okudaira Sadamasa led the castle garrison and held firm, repelling the Takeda siege until an allied Tokugawa-Oda relief force arrived. According to the Shinchō kōki, in 28 June 1575, Nobunaga and Ieyasu brought a total of 38,000 men to relieve the siege on the castle by Katsuyori. Of Takeda's original 15,000 besiegers, only 12,000 faced the Oda–Tokugawa army in this battle. The remaining 3,000 continued the siege to prevent the garrison in the castle from sallying forth and joining the battle. Oda and Tokugawa positioned their men across the plain from the castle, behind the Rengogawa, a small stream whose steep banks would slow down the cavalry charges for which the Takeda clan was known.