Because (Thousand-Year Blood War) is divided into multiple "Cours" (seasons), there are actually three different "Episode 3s" that each mark a major turning point in the war.
Kisuke Urahara sends "Hollowfied" pills to the Captains. Since Hollow power is "poison" to Quincies, it allows the Captains to forcibly take back their stolen Bankai. Bleach: Sennen Kessen-hen Episode 3
Captain Shinji Hirako uses his Bankai, Sakashima Yokoshima Happōfusagari , which was never shown in the original manga. It reverses the concept of "friend or foe," making the Quincy army slaughter each other. Because (Thousand-Year Blood War) is divided into multiple
The Wandenreich officially begins its assault on the Seireitei. The episode is famous for its "0-second" warning—the Soul Society was caught completely off guard, leading to immediate high-stakes casualties. Sakashima Yokoshima Happōfusagari