The Battle of Awaji, an epic clash between the Gani (led by Tsume) and the forces of Tobe (led by Yasashi, Murakami, Gurando, and Himitsu). This culminates in a personal battle between the General and the four Shadow Shogunate officers that only ends when they wound Tsume in about every way possible, getting him down long enough to seal him in a mask.
Hiruzen vs the officers of the Shogunate in the Shadows. Despite being lured into a trap where's he's heavily outnumbered, he just mows them down. It then turns out that Nonki was casting illusions to make Hiruzen think he was killing them (he did succeed in wounding them all, at least). Nonki then gives Hiruzen his toughest fight, finally succeeding in trapping him in a mask.