This is a drawing depicting the last years of Asakura clan. The drawing describes not only division of the castle town but also a mountain castle located on the mountainside behind the town.
This drawing is estimated to have been made after the 4th year of the Kouka era (1848) because explanatory notes on the standing stone found in the ruins of Suwa residence include description of this particular year. Therefore, this drawing is estimated to have been made at the end of the Edo period.