Sengoku Tairan 21 (Rekishi Gunzo Shinsho)

[Machine Translation] The 10,000 Shimazu forces led by Iehisa, who had left Satsuma to join the Tokugawa forces holed up in Fushimi Castle, attempted to attack Osaka at once with the help of the Murakami navy. However, the Kuki navy stood in their way, and the two naval forces launched an unprecedented naval battle in the Akashi Strait. Meanwhile, Sanada's forces bombarded Fushimi Castle with continuous bombardment by the Daizutsu Corps, finally completely destroying the iron gate inside the main gate. The Sanada forces launched a general offensive and succeeded in attacking the Jibusha-circle, and the battle of Fushimi Castle was clearly in favor of Toyotomi. At that moment, however, a tremor occurred in Shinshu. Uesugi Keikatsu finally turned against Toyotomi and attacked Ueda Castle. What was the purpose of Keikatsu's attack on Ueda Castle? Can the Sanada forces avoid the danger of having their castle attacked?

伏見城に篭城する徳川軍に参陣すべく、薩摩を出た家久率いる島津軍一万は、村上水軍の助けを借りて一気に大坂に攻め込もうとする。だが、その前に九鬼水軍が立ちはだかり、両水軍は明石海峡において未曾有の大海戦を開始した。一方、真田軍は大筒隊によって伏見城に間断ない砲撃を加え、ついに大手門内の鉄門を完全に破壊する。総攻撃を開始した真田軍は、治部少曲輪に攻め込むことに成功し、伏見城の大戦は明らかに豊臣方有利となった。しかし、その時、信州で激震が起こる。上杉景勝がついに豊臣に反旗を翻し、上田城を強襲したのだ。果たして、上田城を襲った景勝の目的とは何なのか?居城を襲われた真田軍は、この危機を回避することができるのか。