Description The Summer Battle of Osaka Castle. Panel screen, length: 8 m. 5,071 people and 21 generals are depicted. Kuroda Nagamasa took the painters with him to the battle site, thus the screen was painted from actual visual experience.The Siege of Osaka ( saka no Eki, or, more commonly, saka no Jin) was a series of battles undertaken by the Tokugawa shogunate against the Toyotomi clan, and ending in that clan's destruction