Nagashino Castle is a historic Japanese castle located in Aichi Prefecture. Built in the 16th century, it served as a strategic military base during the Sengoku period. The castle was constructed by the Tokugawa clan to defend against rival forces. The most notable event associated with Nagashino Castle is the Battle of Nagashino in 1575, where the Tokugawa and Oda clans defeated the Takeda clan. This battle is famous for the effective use of firearms, marking a significant shift in Japanese warfare. Today, the castle ruins are a popular tourist attraction, offering insights into Japan's feudal history.