As the news of Nobunaga's death spread from province to province, serious conflicts arose between different clans, including the Tokugawa, Hojo and Uesugi clans and the Sanada clan, which was striving to gain independence, over the former territory of the Takeda clan, which was left without a ruler.
信長の死が諸国へ伝わると、事実上空白地帯となったこの旧武田領を巡って、徳川氏・北条・上杉、および独立を狙った真田が対立を深めていく。