Perry's ships, Sakuma was also sentenced by association to house arrest (蟄居), which he endured for 9 years. During the arrest, he continued to study Western...

Corporation. Retrieved 3 June 2024. Watanabe Daimon (渡邊 大門) (2021). "九度山に蟄居させられた真田昌幸の「懐」事情". rekishijin (in Japanese). ABC ARC, inc. Retrieved 10 June...